四上数学《简便运算》专项练习 姓名:__________ 日期:____月____日 用时:_____ 933−75−525 =933−(75+525) =933−600 =333 51×25×4 =51×(25×4) =51×100 =5100 37×49+37 =37×(49+1) =37×50 =1850 13×25×8 =13×(25×8) =13×200 =2600 27×93+33×93 =(27+33)×93 =60×93 =5580 965−(221+665) =965−665−221 =300−221 =79 36+125+75+24 =(36+24)+(125+75) =60+200 =260 89×81+81 =(89+1)×81 =90×81 =7290 168+509+91+132 =(168+132)+(509+91) =200+600 =800 211+351+189 =(211+189)+351 =400+351 =751
