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数学
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当3x^2-4x-2+( )=2x^2-x,括号内应填
人气:283 ℃ 时间:2020-03-23 05:09:46
解答
(2x^2-x)-(3x^2-4x-2)
=2x²-x-3x²+4x+2
=3x-x²+2
3x^2-4x-2+(3x-x²+2 )=2x^2-x
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