Question

8.61×72.4 十7.24×13.9怎么简便计算

Answer 1

根据题意，这道题的简便计算方法是，原式等于8.61×7.24×10+7.24×13.9=7.24×86.1+7.24×13.9=7.24×（86.1+13.9）=7.24×100=724

Answer 2

8.61×72.4+7.24×13.9
=8.61×72.4+72.4×1.39
=72.4×(8.61+1.39)
=72.4×10
=724