Question

五分之四乘以九分之七乘以八分之五等于多少 用简便方法计算

急急急！！！！快

Answer 1

4/5×7/9×5/8
=4/5×5/8×7/9
=1/2×7/9
=18 分之7

Answer 2

4/5×7/9×5/8
4/5×5/8×7/9
4/8×7/9
1/2×7/9
7/18

Answer 3

3/8×5/7 5/8×4/7 =3/8×5/7 4/8×5/7 =(3/8 4/8)×5/7 =7/8×5/7 =5/8 不会吧，这么简单的问题也来发？

Answer 4

等于七分之十八
或者0.38888888888888888……

Answer 5

4/5×7/9×5/8
==4/5×5/8×7/9
=1/2×7/9
=18 分之7