Question

百分之40等于【 】比50.解方程 2x加百分之40x等于7.2 30X2/3加百分之80x等于60.判断题一种商品,

Answer 1

1.

20/50=40%

2.

2x+40%x=7.2

(2+0.4)x=7.2

x=3

3.

30*2/3+80%x=60

20+0.8x=60

0.8x=40

x=50

4.

错