四年级下册数学简便计算71题
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简介
(4+8)×25 =4×25+8×25 =100+200 =300 (125+40)×8 =125×8+40×8 =1000+320 =1320 25×(40+4) =25×40+25×4 =1000+100 =1100 (80+8)×25 =80×25+8×25 =2000+200 =2200 (43+25)×40 =43×40+25×40 =1720+1000 =2720 (125+25)×8 =125×8+25×8 =1000+200 =1200 36×(100+50) =36×100+36×50 =3600+1800 =5400 (62+25)×4 =62×4+25×4 =248+100 =348 99×(100+7) =99×100+99×7 =9900+693 =10593
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