(300-x ) / (180-x)=4方程,

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(300-x ) / (180-x)=4方程,
(300-x ) / (180-x)=4
方程,

(300-x ) / (180-x)=4方程,
(300-x ) / (180-x)=4
x不能等于180.
300-x=4(180-x)
300-x=720-4x
3x=420
x=140

(300-x ) / (180-x)=4
300-x=4 (180-x)
300-x=720-4x
4x-x=720-300
3x=420
x=140