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x三次方-2x²-4x+8=0 解方程
人气:157 ℃ 时间:2020-02-27 02:50:37
解答
x三次方-2x²-4x+8=0
x^2(x-2)-4(x-2)=0
(x-2)(x^2-4)=0
(x+2)(x-2)^2=0
x+2=0或x-2=0
x=-2或x=2
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