五年级上册数学重点必考 小数乘法简便计算
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简介
1.25×4.37×0.8 =1.25×0.8×4.37 =1×4.37 =4.37 6.4×1.33+3.6×1.33 =1.33×(6.4+3.6) =1.33×10 =13.3 5.8×10.1 =5.8×(10+0.1) =5.8×10+5.8×0.1 =58+0.58 =58.58 10.5×8.5+10.5×1.5 =10.5×(8.5+1.5) =10.5×10 =105 6.74×99+6.74 =6.74×(99+1) =6.74×100 =674
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