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(x-7)(x+3)+(x-1)(x+5)=4x
人气:450 ℃ 时间:2020-04-24 06:37:56
解答
(x-7)(x+3)+(x-1)(x+5)=4x
x^2-4x-21+x^2+4x-5=4x
2x^2-4x-26=0
x^2-2x-13=0
x=[1±√14]
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