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数学
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已知x²-x,B=x²-2x-1,求A+B、A-B
人气:382 ℃ 时间:2020-02-05 03:50:16
解答
A+B
=x^2-x+x^2-2x-1
=2x^2-3x-1
A-B
=x^2-x-(x^2-2x-1)
=x+1
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