billzong
幼苗
共回答了14个问题采纳率:92.9% 举报
x四次方-29x²+100
=(x²-4)(x²-25)
=(x+2)(x-2)(x+5)(x-5)
-2x²z+24xyz-70y²z
=-2z(x²-12xy+35y²)
=-2z(x-5y)(x-7y)
(x+y)²-4(x+y)-12
=(x+y-6)(x+y+2)
x²+(k+2)x+(k+1)=(x+1)(x+k+1)
4a²b²-(a²+b²)²
=[2ab+(a²+b²)][2ab-(a²+b²)]
=-(a+b)²(a-b)²
1年前
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