Question

快来帮忙解答有高分，谢谢大家了。几道简单的计算题。

Answer 1

4/5×2/3×5/4
=2/3
(3/4+6/7)×28
=21+24
=45
57×3/56
=(56+1)×3/56
=3+1/56
=169/56
5/7+12/7×1/4
=5/7+3/7
=8/7
(2/5+3/4)×40
=16+30
=46
75×11/76
=(76-1)×11/76
=11-1/76
=10+75/76(10 又76分之75）
5/9-7/16×5/9
=5/9×（1-7/16）
=5/9×9/16
=5/16
4/11×8/13+4/11×5/13
=4/11×（8/13+5/13）
=4/11
19×7/18
=（18+1）×7/18
=7+7/18
=7又18分之7
（3/4+5/8）×24
=18+15
=33
7/8×3/4+1/8×3/4
=3/4（7/8+1/8）
=3/4
5/4×1/8×16
=5/2