Question

8.5乘1.6乘12.5的简便方法？

Answer 1

1.6＝2×0.8，且125×8＝1000，所以原式等于8.5×2×0.8×12.5，运用乘法结合律就是8.5×2×（12.5×0.8）＝17×10＝170。

Answer 2

8.5×1.6×12.5
=8.5×0.2×8×12.5
=（8.5×0.2）×（8×12.5）
=1.7×100
=170