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x²-2x-x+2=0怎么算
人气:412 ℃ 时间:2020-02-05 14:07:37
解答
x²-2x-x+2 = 0
x²-3x = -2
x²-3x+9/4 = -2+9/4
(x-3/2)² = 1/4
x= ±1/2+3/2
x1 = 2
x2 = 1
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