算一道简单方程(180-x)/(90-x)=4
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算一道简单方程
(180-x)/(90-x)=4
(180-x)/(90-x)=4
![算一道简单方程(180-x)/(90-x)=4](/uploads/image/z/5040079-7-9.jpg?t=%E7%AE%97%E4%B8%80%E9%81%93%E7%AE%80%E5%8D%95%E6%96%B9%E7%A8%8B%28180-x%29%2F%2890-x%29%3D4)
用交叉相乘法
180-x 4
--------=----
90 -x 1
--1*(180-x)=4*(90-x)
180-x=360-4x
3x=180 '移项
x=60
180-x=(90-x)*4
180-x=90*4-4*x
180-x=360-4*x
-x+4*x=360-180
3x=180
x=60
180-x 4
--------=----
90 -x 1
--1*(180-x)=4*(90-x)
180-x=360-4x
3x=180 '移项
x=60
180-x=(90-x)*4
180-x=90*4-4*x
180-x=360-4*x
-x+4*x=360-180
3x=180
x=60