2分之一比7分之二等于三分之一比(4-x)解比例

2024-12-05 03:46:25
推荐回答(1个)
回答1:

1/2 :2/7 = 1/3 :(4-x)
1/2(4-x)=2/7 * 1/3
2 - 1/2x = 2/21
2 - 2/21 = 1/2x
x = 80/21