Question

十六分之十五÷20×五分之四 六分之五加三分之二÷九分之八 (八分之七减三十二分之二十一)÷八分之七

能简算的要简算。

Answer 1

十六分之十五÷20×五分之四
=15/16×1/20×4/5
=3/80
六分之五加三分之二÷九分之八
=5/6+2/3×9/8
=5/6+3/4
=19/12
(八分之七减三十二分之二十一)÷八分之七
= (7/8 -31/32)×8/7
= 7/8 ×8/7 -21/32 ×8/7
=1-3/4
=1/4

Answer 2

1、15/16÷20×4/5=15/16×1/20×4/5=3/80
2、5/6＋2/3÷8/9=5/6＋2/3×9/8=5/6＋3/4=10/12＋9/12=19/12
3、﹙7/8－21/32﹚÷7/8=﹙28/32－21/32﹚÷7/8=7/32÷7/8=7/32×8/7=1/4

Answer 3

15/16÷20×4/5
=15/16×1/20×4/5
=3/80
5/6+2/3÷8/9
=5/6+2/3×9/8
=5/6+3/4
=19/12
（7/8-21/32）÷7/8
=（28/32-21/32）×8/7
=7/32×8/7
=1/4