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
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算一道简单方程(180-x)/(90-x)=4
算一道简单方程
(180-x)/(90-x)=4

算一道简单方程(180-x)/(90-x)=4
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)/(90-x)=4
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

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)
180-x=360-4x
3x=189
x=60