小学数学【小数简便计算】经典例题解析
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简介
3.07-0.38-1.62 1.29+3.7+2.71+6.3 =3.07-(0.38+1.62) =(1.29+2.71)+(3.7+6.3) =3.07-2 =4+10 =1.07 =14 (减法的性质) (加法交换律和加法结合律) 8-2.45-1.55 3.25+1.79-0.59+1.75 =8-(2.45+1.55) =(3.25+1.75)+(1.79-0.59) =8-4 =5+1.2 =4 =6.2 (减法的性质) (同级运算交换) 23.4-0.8-13.4-7.2 0.32×403 (23.4-13.4)-0.8-7.2 =0.32×(400+3) =10-(0.8+7.2) =0.32×400+0.32×3 10-8 =128+0.96 =2 =128.96 (减法交换和减法的性质) (拆数，乘法分配律) 3.2+0.36+4.8+1.64 1.23+3.4-0.23+6.6 =(3.2+4.8)+(0.36+1.64) =(1.23-0.23)+(3.4+6.6) =8+2 =1+10 =10 =11 (加法交换律和加法结合律) (同级运算交换)
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