小学总复习简便运算238题(有答案).doc
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30 数学简便运算------ 小学数学简便运算专项练习238题(有答案) 1.(0.86+0.86+0.86+0.86)×25 2. 4÷1+6× 3. 125÷(50÷8) 4. 7.6×÷[1.9﹣1.9×(1.9﹣1.9)]. 5.999×999﹣2×999+1. 6.1.25×0.25×0.05×64 7. 20.06×65+380×2.006﹣2.006×30. 8. (﹣÷4×)÷ 9. ×23 10. 38﹣15.38+61.25﹣3.62 11. 17.98+2.5×0.3﹣18÷1.5 12. ×+× 13.(+)÷. 14. 15. 16. 17. . 18. 22.7×1.25×0.8 19. 3.91×2.8+6.09×2.8. 20. 23.4×16﹣23.4×6 21. 20﹣5.75﹣14.25 22. 1.25×0.25×32 23. 56×(﹣+) 24.0.279×258+0.742×279 25. 13÷28+11÷27+15÷28+38÷27. 26. (+)×24×15 27. 3.7×+5.3×0.75+. 28. 9.9+99.9+999.9 29. 6.8÷4﹣1.2×25%+4×0.25. 30. 6.3+6.44+2.7+3.56 31. 15.35﹣(5.35+7.2) 32. 600÷12 33. 67×102. 34. 35. 36. 37. . 38. 1.3﹣3.79+9.7﹣6.21 39. 3.64÷4+4.36×0.25 40. ÷(﹣)×(﹣) 41. 9×4.25+4× 42. (﹣)×4×9 43. 1+2+3+4+…+49+50. 44. 4.8×0.25 45. 2.33×0.5×4 46. 1.2×2.5+0.8×2.5 47. 3.7÷1.25÷8. 48. 43.6+9.8+6.4 49. 17.3×0.25×8 50. 2.31×1.5+1.5×7.69. 51. 10.24﹣6.67﹣1.33 52. 32000÷125÷8 53. 7.31+15.05+2.69+4.95 54. 47×101 55.573﹣298 56. 194+501 57. 627﹣(427+189) 58. 630÷14 59. 125×25×32 60. 210÷6÷5. 61.125×32 62. 640÷5÷8 63. 653﹣98 64. 944+102. 65.25×79×4 66. 8×166×25 67. 50×25×4×3 68. 8×(25×15) 69. (250×72)×4 70. 5×25×13×40×20. 71. 7350÷25 72. 54×101 73. 227+364+146+173 74. 5604﹣(723+1604) 75. ×1.67+0.33× 76. 999×667+667. 77. 2004× 78. 81﹣(3.81﹣1.65)+2.25 79. 24×(﹣+). 80. (+)×24 81. +× 82. 2.5×3.2×1.25 83. 4.05﹣(2.05+) 84. 5.39++4.61+ 85.0.588×+4×9.412+×0.588. 86.45×98+45×2 87. 452﹣(152+240) 88. 99×27 89. 1120÷16÷7 90. 113×36﹣13×36 91. 179﹣245+321﹣155. 92.1.24+14.95+8.76﹣4.95 93. 52.7﹣5.27﹣2.7 94. 35×201 95. 4500÷25÷4 96. 125×32 97. 654××99+346×99. 98. 56×12.5 99. 14.6﹣(4.6+7.2) 100. 99×99+199. 101.0.125×0.25×8×4 102. 1927﹣528﹣472. 103. (++)×105 104. ×+25%×+0.25× 105. 2+3﹣3+1+1 106. 3.7×99+3.7 107. 1.2×2.5+2.8×2.5 108. 4.8×2.5. 109. 4.05﹣2.86﹣0.14 110. 7×+0.4×7 111. 2.25×3.14×4+3.14 112. (﹣)×17×15. 113. 6.3×8.7+8.7×3.7 114. (﹣+)×12 115. ×+÷. 116. 7.25﹣3+3.75﹣6 117. 49×(+)×25 118. ×+÷﹣. 119. ﹣+ 120. ×12.5×8×0.4 121. ×12. 122. 25×0.32×1.25 123. 0.37×79+3.7×2.1 124. 2011÷2011+ 125. ++++ 126. (﹣)×12 127. 1000+999×999. 128. 178.4﹣45.3﹣54.7 129. 456﹣(256﹣144) 130. 102×45 131. 32×125×25 132. 43×99+43 133. (40+8)×25 134. 73×99 135. 54×11﹣54. 136. 301×79 137. 125×72×4 138. 728×79十272×79 139. 8.59+2.57+3.43+5.47 140. 49.62+27.17﹣19.62 141. 1546﹣(546﹣239) 142. . 143.1999+999×999. 144. 4.37×6.3+4.37×3.7 145. 2.64÷1.25÷0.8 146. 10.2×0.45. 147. 3.5%×9.9 148. 1+3+5+7+9 149. 2008×20072008﹣2006×20082007. 150. 24.87﹣0.53﹣1.47 151. 50× 152. 0.375×. 153. 7.5+2.7+2.7+2.5+4.3 154. 7.9﹣3.27﹣0.73+1.1 155. 72×125 156. (80+4)×125 157. 67×88+67×11+67 158. 203×15. 159. 4392﹣2997 160. 2.5×32×1.25 161. ×+÷ 162. 13×+ 163. 9÷[(20.75﹣9.5)]×0.4] 164. ÷﹣×. 165. 1.25×32×2.5 166. 4×3.5+4.8×7﹣480% 167.(5﹣1.8)÷[(1.15+)×1] 168. 3333×224+6666×368. 169. 395﹣283+154+246﹣117 170. 8795﹣4998+2994﹣3002﹣2008 171. 1999+999×999 172. 38×25×6. 173. 2.06×101 174. 0.25×125×0.32 175. 1.25×8.8 176. 31.8×2.5+31.8×7.5. 177. 19×8×125 178. 38+129+71 179. 1756﹣398 180. 406×201 181. 16×125 182. 1900÷4÷25. 183. 8.35+3.8﹣2.35 184. 15.4﹣(5.4+2.3) 185. 98×45 186. 16×125×25 187. 12×69﹣69×2 188. (20+8)×25. 189. 9+99+999+9999+99999; 190. 1﹣2+3﹣4+5﹣6+…﹣1992+1993. 191. 36×11; 192. 246×11. 193. 678+(354+322) 194. 283+147+17+1653 195. 384﹣(37+184) 196. 2904﹣1327﹣173 197. 653﹣197 198. 125×17﹣125 199. 235×99 200. (1300﹣520)÷13 201. 67×21+18×21+85×79 202. 222222×999999. 203. 18×+2 204. ×﹣. 205. 0.8×7.3﹣63×20.08 206. 65.5﹣4.29+24.6﹣5.71 207. 1991+1989+2000+1995+2011+2005+1998+1993. 208. 99999×22222+33333×33334 209. 2003×2004÷2004×2004﹣2003×2004 210. 2.8×(+) 211. 101× 212. 9.81×10%+0.5×98.1+0.049×981 213. 23×+14×. 214. 38.4×187﹣15.4×384+3.3×16= 215. 3﹣(0.16+1)﹣1.84 216. 2009÷2009 217. 9+99+999+9999﹣ 218. 4.03÷12.5. 219. 1997+1998+1999+2001 220. 3425﹣188﹣212﹣25 221. 567×999+567×2 222.( 91×48×75 )÷( 25×13×16) 223. ×3+×5+×10 224. 999×7+111×7 225. 97× 226. (+++)×2002 227. 8.5×+0.75×5+6.5÷1 228. ++++. 229. 1.25×1.25×32 230. 15×(+)×17. 231. 25×99+25 232. 75×75+75×25 233. 64×125 234. 17+64+83+36 235. 1200﹣128﹣72 236. 3000÷125÷8. 237..65×8.7+6.5×0.23﹣0.65 238. . 答案: 1.(0.86+0.86+0.86+0.86)×25, =0.86×(4×25), =0.86×100, =86; 2. 4÷1+6×, =(4+6)×, =10×, =6; 3. 125÷(50÷8), =125×8÷50, =1000÷50, =20; 4. 7.6×÷[1.9﹣1.9×(1.9﹣1.9)], =7.6×÷[1.9﹣1.9×0], =7.6×÷1.9, =7.6×, =2 5.999×999﹣2×999+1, =(1000﹣1)×(999﹣2)+1, =(1000﹣1)×997+1, =1000×997﹣1×997+1, =997000﹣997+1, =996004 6.1.25×0.25×0.05×64, =1.25×0.25×0.05×(8×4×2), =(1.25×8)×(0.25×4)×(0.05×2), =10×1×0.1, =1; 7. 20.06×65+380×2.006﹣2.006×30, =20.06×65+(380﹣30)×2.006, =20.06×65+350×2.006, =20.06×65+(350÷10)×(2.006×10), =20.06×65+35×20.06, =20.06×(65+35), =20.06×100, =2006 8. (﹣÷4×)÷, =()÷, =()×2, =2, =; 9. ×23, =(24﹣1), =24, =23, =; 10. 38﹣15.38+61.25﹣3.62, =38.75+61.25﹣(15.38+3.62), =100﹣19, =81; 11. 17.98+2.5×0.3﹣18÷1.5, =17.98+0.75﹣12, =18.73﹣12, =6.73; 12. ×+×, =()×, =1×, =; 13.(+)÷. =, =2+1, =3 14. , =4.76+5.24+5, =10+5, =15, 15. , =3﹣0.16﹣1﹣1.84, =(3﹣1)﹣(0.16+1.84), =2﹣2, =0; 16. , =2.8﹣[0.43+(+1)], =2.8﹣[0.43+2], =2.8﹣2.43, =0.37; 17. , =9.56﹣(3+2), =9.56﹣6, =3.56 18. 22.7×1.25×0.8, =22.7×(1.25×0.8), =22.7×1, =22.7; 19. 3.91×2.8+6.09×2.8, =(3.91+6.09)×2.8, =10×2.8, =28 20. 23.4×16﹣23.4×6, =(16﹣6)×23.4, =10×23.4, =234; 21. 20﹣5.75﹣14.25, =20﹣(5.75+14.25), =20﹣20, =; 22. 1.25×0.25×32, =1.25×0.25×8×4, =1.25×8×(0.25×4), =10×1, =10; 23. 56×(﹣+), =56×﹣56×+56×, =24﹣21+2, =5 24. 0.279×258+0.742×279, =279×0.258+0.742×289, =279×(0.258+0.742), =279×1, =279; 25. 13÷28+11÷27+15÷28+38÷27, =, =()+(), =1+, =2 26. (+)×24×15, =, =150+24, =174; 27. 3.7×+5.3×0.75+. =(3.7+5.3+1)×0.75, =10×0.75, =7.5; 28. 9.9+99.9+999.9, =(9.9+0.1)+(99.9+0.1)+(999.9+0.1)﹣0.1×3, =10+100+1000﹣0.3, =1110﹣0.3, =1109.7; 29. 6.8÷4﹣1.2×25%+4×0.25. =6.8×﹣1.2×+4.4×, =(6.8﹣1.2+4.4)×, =10×, =2.5 30. 6.3+6.44+2.7+3.56, =(6.3+2.7)+(6.44+3.56), =9+10, =19; 31. 15.35﹣(5.35+7.2), =15.35﹣5.35﹣7.2, =10﹣7.2, =2.8; 32. 600÷12, =600÷(6×2), =600÷6÷2, =100÷2, =50; 33. 67×102, =67×(100+2), =67×100+67×2, =6700+134, =6834 34. , =4.85+5.15﹣(), =10﹣1, =9; 35. , =(4.75×﹣3.6+6.15×3.6), =[(4.75+6.15﹣1)×3.6], =9.9×3.6, =3.96; 36. , =[], =, =, =; 37. . =(1+3+5+7+9)+()+(), =25+()+(), =25++, =25+(), =25+, =25+(), =25 =. 38. 1.3﹣3.79+9.7﹣6.21, =(1.3+9.7)﹣(3.79+6.21), =11﹣10, =1; 39. 3.64÷4+4.36×0.25, =3.64×+4.36×, =(3.64+4.36)×, =8×, =2; 40. ÷(﹣)×(﹣), =÷×, =×, =; 41. 9×4.25+4×, =9×4+4×, =(9+)×4, =10×, =; 42. (﹣)×4×9, =(﹣)×(4×9), =(﹣)×36, =×36﹣×36, =4﹣3, =1; 43. 1+2+3+4+…+49+50, =(1+50)+(2+49)+(3+48)+…+(25+26), =51+51+51+51+…+51, =51×25, =1275 44. 4.8×0.25, =1.2×(4×0.25), =1.2×1, =1.2; 45. 2.33×0.5×4, =2.33×(0.5×4), =2.33×2, =4.66; 46. 1.2×2.5+0.8×2.5, =(1.2+0.8)×2.5, =2×2.5, =5; 47. 3.7÷1.25÷8. =3.7÷(1.25×8), =3.7÷10, =0.37 48. 43.6+9.8+6.4, =9.8+(43.6+6.4), =9.8+50, =59.8; 49. 17.3×0.25×8, =17.3×(0.25×8), =17.3×2, =34.6; 50. 2.31×1.5+1.5×7.69. =(2.31+7.69)×1.5, =10×1.5, =15 51. 10.24﹣6.67﹣1.33, =10.24﹣(6.67+1.33), =10.24﹣8, =2.24; 52. 32000÷125÷8, =32000÷(125×8), =32000÷1000, =32; 53. 7.31+15.05+2.69+4.95, =(7.31+2.69)+(15.05+4.95), =10+20, =30; 54. 47×101, =47+(100+1), =47×100+47, =4700+47, =4747 55. 573﹣298, =573﹣300+2, =275; 56. 194+501, =194+500+1, =695; 57. 627﹣(427+189), =627﹣427﹣189, =11; 58. 630÷14, =630÷7÷2, =90÷2, =45; 59. 125×25×32, =(125×8)×(25×4), =1000×100, =100000; 60. 210÷6÷5, =210÷(6×5), =210÷30, =7 61. 125×32, =125×8×4, =1000×4, =4000; 62. 640÷5÷8, =640÷(5×8), =640÷40, =16; 63. 653﹣98, =653﹣100+2, =453+2, =455; 64. 944+102, =944+100+2, =1044+2, =1046 65.25×79×4 =25×4×79 =100×79 =7900 66. 8×166×25 =8×25×166 =200×166 =33200 67. 50×25×4×3 =(25×4)×(50×3) =100×150 =15000 68. 8×(25×15) =8×25×15 =200×15 =3000 69. (250×72)×4 =250×4×72 =1000×72 =72000 70. 5×25×13×40×20 =(25×40)×(5×20)×13 =1000×100×13 =1300000 71. 7350÷25, =(7350×4)÷(25×4), =29400÷100, =294; 72. 54×101, =54×100+54, =5454; 73. 227+364+146+173, =(227+173)+(364+146), =400+510, =910; 74. 5604﹣(723+1604), =5604﹣1604﹣723, =3277 75. ×1.67+0.33×, =×(1.67+0.33), =×2, =; 76. 999×667+667×1, =667×(999+1), =667×1000, =667000 77. 2004×, =(2003+1)×, =2003×+1×, =2002+, =2002; 78. 81﹣(3.81﹣1.65)+2.25, =81﹣3.81+1.65+2.25, =(81﹣3.81)+(1.65+2.25), =77.19+3.9, =81.09; 79. 24×(﹣+), =24×﹣24×+24×, =20﹣6+16, =14+16, =30 80. (+)×24, =×24+×24, =16+6, =22; 81. +×, =×+×, =(+)×, =×, = 82. 2.5×3.2×1.25, =(2.5×0.4)×(8×1.25), =1×10, =10; 83. 4.05﹣(2.05+), =4.05﹣2.05﹣, =2﹣, =1; 84. 5.39++4.61+, =(5.39+4.61)+(1+), =10+2, =12; 85. 0.588×+4×9.412+×0.588, =0.588×(1+2)+4×9.412, =0.588×4+4×9.412, =4×(0.588+9.412), =4×10, =40 86. 45×98+45×2, =45×(98+2), =45×100, =4500; 87. 452﹣(152+240), =452﹣152﹣240, =60; 88. 99×27, =(100﹣1)×27, =2700﹣27, =2673; 89. 1120÷16÷7, =1120÷(16×7), =1120÷112, =10 90. 113×36﹣13×36, =36×(113﹣13), =36×100, =3600; 91. 179﹣245+321﹣155, =(179+321)﹣(245+155), =400﹣400, =0 92. 1.24+14.95+8.76﹣4.95, =(1.24+8.76)+(14.95﹣4.95), =10+10, =20; 93. 52.7﹣5.27﹣2.7, =(52.7﹣2.7)﹣5.27, =50﹣(5+0.27), =50﹣5﹣0.27, =45﹣0.27, =44.73; 94. 35×201, =35×(200+1), =35×200+35, =7000+35, =7035; 95. 4500÷25÷4, =4500÷(25×4), =4500÷100, =45; 96. 125×32, =(125×8)×4, =1000×4, =4000; 97. 654×99+346×99, =(654+346)×99, =1000×99, =99000 98. 56×12.5, =7×(8×12.5), =7×100, =700; 99. 14.6﹣(4.6+7.2), =14.6﹣4.6﹣7.2, =10﹣7.2, =2.8; 100. 99×99+199, =99×99+99+100, =99×(99+1)+100, =99×100+100, =9900+100, =10000 101. 0.125×0.25×8×4, =(0.125×8)×(0.25×4), =1×1, =1; 102. 1927﹣528﹣472, =1927﹣(528+472), =1927﹣1000, =927 103. (++)×105, =×105+×105+×105, =35+21+7, =56+7, =63; 104. ×+25%×+0.25×, =×+×+×, =(++)×, =×, =; 105. 2+3﹣3+1+1, =(2+1﹣3)+(1+3), =(4﹣3)+5, =+5, =5; 106. 3.7×99+3.7, =3.7×(99+1), =3.7×100, =370 107. 1.2×2.5+2.8×2.5, =(1.2+2.8)×2.5, =4×2.5, =10; 108. 4.8×2.5, =(4×1.2)×2.5, =(4×2.5)×1.2, =10×1.2, =12 109. 4.05﹣2.86﹣0.14, =4.05﹣(2.86+0.14), =4.05﹣3, =1.05; 110. +0.4×, =(0.6+0.4), =×1, =; 111. 2.25×3.14×4+3.14, =2.25×4×3.14+3.14, =9×3.14+3.14, =(9+1)×3.14, =10×3.14, =31.4; 112. (﹣)×17×15, =×15×17﹣17×15, =17﹣5, =12 113.6.3×8.7+8.7×3.7 =(6.3+3.7)×8.7 =10×8.7 =87; 114. (﹣+)×12 =×12﹣×12+×12 =4﹣2+3 =5; 115. ×+÷. =×+× =( +)× =2× =1 116. 7.25﹣3+3.75﹣6, =(7.25+3.75)﹣(3+6), =11﹣9, =2. 117. 49×(+)×25, =49××25, =595; 118. , =×+×﹣, =()×, =×, = 119. ﹣+, =, =1, =; 120. ×12.5×8×0.4, =()×(12.5×0.4), =2×5, =10; 121. ×12, =(24×)×12, =(9﹣4)×12, =5×12, =60 122. 25×0.32×1.25, =25×0.4×0.8×1.25, =(25×0.4)×(0.8×1.25), =10×1, =10; 123. 0.37×79+3.7×2.1, =3.7×7.9+3.7×2.1, =3.7×(7.9+2.1), =3.7×10, =37; 124. 2011÷2011+, =2011÷+, =2011×+, =2001×, =+, =1; 125. ++++, =1﹣+﹣+﹣+﹣+﹣, =1﹣, =; 126. (﹣)×12, =×12﹣×12, =7﹣6, =1; 127. 1000+999×999, =1000+999×(1000﹣1), =1000+999×1000﹣999×1, =1000+999000﹣999, =1000000﹣999, =999001 128. 178.4﹣45.3﹣54.7, =178.4﹣(45.3+54.7), =178.4﹣100, =78.4; 129. 456﹣(256﹣144), =456﹣256﹣144, =200﹣144, =56; 130. 102×45, =100×45+2×45, =4500+90, =4590; 131. 32×125×25, =(8×125)×(4×25), =1000×100, =100000; 132. 43×99+43, =(99+1)×43, =100×43, =4300; 133. (40+8)×25, =40×25+8×25, =1000+200, =1200; 134. 73×99, =73×100﹣73×1, =7300﹣73, =7227; 135. 54×11﹣54, =(11﹣1)×54, =10×54, =540 136. 301×79, =(300+1)×79, =300×79+1×79, =23700+79, =23779; 137. 125×72×4, =(125×4)×72, =500×72, =36000; 138. 728×79十272×79, =79×(728+272), =79×1000, =79000; 139. 8.59+2.57+3.43+5.47, =8.59+(2.57+3.43)+5.47, =8.59+6+5.47, =20.06; 140. 49.62+27.17﹣19.62, =49.62﹣19.62+27.17, =30+27.17, =57.17; 141. 1546﹣(546﹣239), =1546﹣546+239, =1000+239, =1239 142.×+×+×+×, =(+++)×, =(+++)×, =×, = 143.1999+999×999, =(1000﹣1)×999+1999, =999000﹣999+1999, =999000+1000,=1000000 144. 4.37×6.3+4.37×3.7, =4.37×(6.3+3.7), =4.37×10, =43.7; 145. 2.64÷1.25÷0.8, =2.64÷(1.25×0.8), =2.64÷1, =2.64; 146. 10.2×0.45, =(10+2)×0.45, =10×0.45+2×0.45, =4.5+0.9, =5.4. 147. 3.5%×9.9, =0.035×(10﹣0.1), =0.035×10﹣0.035×0.1, =0.35﹣0.0035, =0.3465; 148. 1+3+5+7+9, =1++3++5++7++9+, =(1+3+5+7+9)+(++++), =25+(1﹣+﹣+﹣+﹣+﹣), =25+(1﹣), =25+, =25; 149. 2008×20072008﹣2006×20082007, =2008×(2007×10000+2007+1)﹣2006×(2008×10000+2007), =2008×2007×10000+2007×2008+2008﹣2006×2008×10000﹣2006×2007, =2008×10000+2×2007+2008, =20080000+4014+2008, =20086022 150. 24.87﹣0.53﹣1.47, =24.87﹣(0.53+1.47), =24.87﹣2, =22.87; 151. 50×, =50×, =15+20﹣12, =35﹣12, =23; 152. 0.375×, =×+﹣, =(+1﹣)×, =8×, =3 153. 7.5+2.7+2.7+2.5+4.3 =(7.5+2.5)+(2.7+4.3)+2.7, =10+7+2.7, =19.7; 154. 7.9﹣3.27﹣0.73+1.1 =7.9+1.1﹣(3.27+0.73), =9﹣4, =5; 155. 72×125 =9×8×125, =9×(8×125), =9×1000, =9000; 156. (80+4)×125 =80×125+4×125, =10000+500, =10500; 157. 67×88+67×11+67 =(88+11+1)×67, =100×67, =6700. 158. 203×15 =(200+3)×15, =200×15+3×15, =3000+45, =3045 159. 4392﹣2997, =4392﹣3000+3, =1392+3, =1395; 160. 2.5×32×1.25, =(2.5×4)×(8×1.25), =10×10, =100; 161. ×+÷, =()×, =1×, =; 162. 13×+, =(13+1)×, =14×, =6; 163. 9÷[(20.75﹣9.5)]×0.4], =9÷[11.25×0.4], =9÷[(10+1.25)×0.4], =9÷[10×0.4+1.25×0.4], =9÷[4+0.5], =9÷4.5, =2; 164. ÷﹣×, =﹣×, =×(1﹣), =×, =0.3 165. 1.25×32×2.5, =(1展开阅读全文
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