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合并同类项:3x^2-[7x-2(4x+2)+2x^2]-x^2
人气:486 ℃ 时间:2020-01-25 13:31:49
解答
3x^2-[7x-2(4x+2)+2x^2]-x^2
=3x^2-[7x-8x-4+2x^2]-x^2
=3x^2+x+4-2x^2-x^2
=x+4
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