6640154
幼苗
共回答了20个问题采纳率:80% 举报
1)4x³-6x²-2x
=2x(2x²-3x-1)
2)a(x-3)³-b(y-x)²
3)9m²-n²
=(3m)²-n²
=(3m+n)(3m-n)
4)25x²-1/16y²
=(5x)²-(y/4)²
=(5x+y/4)(5x-y/4)
5)(x²-y²)²-4x²y²
=(x²-y²)²-(2xy)²
=(x²-y²+2xy)(x²-y²+2xy)
6)(xy)²-4xy+4
=(xy-2)²
7)m的四次方-2m²+1
=(m²)²-2m²+1
=(m²-1)²
=(m+1)²(m-1)²
8)(x+y)²+18(x+y)+81
=(x+y)²+18(x+y)+9²
=(x+y+9)²
9)(x²+2x²)+2(x²+2x)+1
=3x²+2x²+4x+1
=5x²+4x+1
1年前
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