(180-X):(X-30)=3:2 解方程,拜托,一定要有过程!

2024-11-02 21:13:10
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回答1:

(180-X):(X-30)=3:2
2(180-x)=3(x-30)
360-2x=3x-90
360+90=3x+2x
5x=450
x=90