Question

计算，能简便的就用简便算法

21/50÷7/10
5/7÷3/4÷5/7
5/6÷4/9×0.24
（0.75-3/16）×（2/9+1/3）
2/9×4/5×36×100

Answer 1

(21/50)÷(7/10)=(21/7)/(50/10)=3/5
(5/7)÷(3/4)÷(5/7)=(5/7)/(5/7)/(3/4)=4/3
(5/6)÷(4/9)×0.24=(5/6)÷(4/9)×(6/25)=(5/25)×(6/6×9/4)=9/20
（0.75-3/16）×（2/9+1/3）=(3/4-3/16)×(2/9+1/3)=(9/16)×(5/9)=5/16
2/9×4/5×36×100=2×4×36/9×100/5=640

Answer 2

21/50÷7/10
=21/50×10/7
=3/5

5/7÷3/4÷5/7
=5/7÷5/7×4/3
=4/3

5/6÷4/9×0.24
=5/6×0.24×9/4
=0.2×9/4
=9/20

（0.75-3/16）×（2/9+1/3）
=9/16×5/9
=5/16

2/9×4/5×36×100
=8×80
=640

Answer 3

21/50÷7/10=21/50*10/7=3/5
5/7*4/3*7/5=4/3
5/6*4/9*24/100=9/20
（3/4-3/16）*（2/9+3/9）=9/16*5/9=5/16
2/9*（4/5*36）*100=2*4*4*20=640