90-x:180-x 求x (90-X):[90+(90-X)]=2:11 sorry 一时疏忽

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90-x:180-x 求x
(90-X):[90+(90-X)]=2:11
sorry 一时疏忽

2[90+（90-x)]=11(90-x)
180+2(90-x)=990-11x
180+180-2x=990-11x
360-2x=990-11x
11x-2x=990-360
9x=630
x=70

180+180-2x=990-11x
9x=630
x=70

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