Question

能简算的要用简便方法计算①3.28×0.46+6.72×0.46？

Answer 1

解题思路：①、②利用小数乘法分配律的逆运算，
③、④按小数四则混合运算的顺序计算，先算乘除后算加减，
⑤、⑥按小数四则混合运算的顺序计算，先算乘除后算加减，有括号的先算括号里面的，
①3.28×0.46+6.72×0.46，
=（3.28+6.72）×0.46，
=10×0.46，
=4.6，
②9.73×2.8-4.73×2.8，
=（9.73-4.73）×2.8，
=5×2.8，
=14，
③1.35×6.2+5.79÷0.3，
=8.37+19.3，
=27.67，
④27.9+3.6×2.5÷0.48，
=27.9+18.75，
=46.65，
⑤0.6×（5.3-1.7）÷0.9，
=0.6×3.6÷0.9，
=2.4，
⑥6.4÷[（4.3+2.1）÷0.8]，
=6.4÷6.4×0.8，
=1×0.8，
=0.8．
,1,能简算的要用简便方法计算
①3.28×0.46+6.72×0.46
②9.73×2.8-4.73×2.8
③1.35×6.2+5.79÷0.3
④27.9+3.6×2.5÷0.48
⑤0.6×（5.3-1.7）÷0.9
⑥6.4÷[（4.3+2.1）÷0.8]．