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1)x^3-4x^2-21x
2)x^2y+10xy+25y
人气:230 ℃ 时间:2020-05-12 21:13:07
解答
1)x^3-4x^2-21x
=x(x^2-4x-21)
=x(x+3)(x-7)
2)x^2y+10xy+25y
=y(x^2+10x+25)
=y(x+5)^2
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