五年级上册数学『小数简便运算』计算题大全
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简介
加法交换律简算 加法结合律简算 乘法交换律简算 乘法结合律简算 0.75+9.8+0.25 48.8+0.4+0.6 2.5×5.6×0.4 99×12.5×0.8 =0.75+0.25+9.8 =48.8+(0.4+0.6) =2.5×0.4×5.6 =99×(12.5×0.8) =1+9.8 =10.8 =48.8+1 =49.8 =1×5.6 =5.6 =99×10 =990 含加法交换律与结合律 含乘法交换律与结合律 因数换减法 因数换加法 6.5+0.28+3.5+0.72 2.5×1.25×0.4×0.8 99×2.6 4.5×102 =6.5+3.5+0.28+0.72 =2.5×0.4×1.25×0.8 =(100-1)×2.6 =4.5×(100+2) =(6.5+3.5)+(0.28+0.72) =(2.5×0.4)×(1.25×0.8) =100×2.6-1×2.6 =4.5×100+4.5×2 =10+1 =11 =1×1 =1 =260-2.6 =257.4 =450+9 =459
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