0.8×72.4×12.4用简便运算急

分类: 作业答案 • 2022-01-02 19:57:12

问题描述：

0.8×72.4×12.4用简便运算
急

答

用分数试试

答

0.8×72.4×12.4
=0.8×72.4×(12.5-0.1)
=10x72.4-0.08x72.4
=724-(7.24-1.448)
=724-7.24+1.448
=714+2.76+1.448
=714+3+1.448-0.24
=718.208