(x+7+x)^2=10(x+7)+x

稀奇虫子candy2022-10-04 11:39:541条回答

(x+7+x)^2=10(x+7)+x
(x+7+x)^2=10(x+7)+x
x^2+49+x^2=10x+70+x
2x^2+49-10x-70-x=0
求下面的过程

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简单幸福滋味共回答了15个问题 | 采纳率93.3%: (x+7+x)^2=10(x+7)+x
(2x+7)^2=11x+70
4x^2+28x+49=11x+70
4x^2+17x-21=0
(4x+21)(x-1)=0
x1=1,x2=-21/4; 1年前