Question

5/8-1/3+5/52

5/9×7/12+5/12÷9/5
2/3+5/4×2/5-5/6
[5/8-（1/2+1/3）×3/4]÷16/23
3/5与1/2的差除以7/4,商是多少
9比一个数的4/5少1,求这个数

Answer 1

5/9×7/12+5/12÷9/5
= 5/9 × 7/12 + 5/12 × 5/9
= 5/9 × (7/12 + 5/12)
= 5/9 × 1
= 5/9
2/3+5/4×2/5-5/6
= 2/3 + 1/2 - 5/6
= 7/6 - 5/6
= 1/3
[5/8-（1/2+1/3）×3/4]÷16/23
= (5/8 - 5/6 × 3/4) × 23/16
= (5/8 - 5/8) × 23/16
= 0 × 23/16
= 0
3/5与1/2的差除以7/4,商是多少
(3/5 - 1/2) ÷ 7/4
= 1/10 × 4/7
= 2/35
9比一个数的4/5少1,求这个数
(9 + 1) ÷ 4/5
= 10 × 5/4
= 25/2