山色遥连
幼苗
共回答了24个问题采纳率:75% 举报
1:=(m^2-m)(a-2)
2:-4x²yz-12xy²z+4xyz
=-4xyz(x+y-1)
3:45a²-20a
=5a(9a-4)
4:-x²+4y²
=4y²-x²
=(2y+x)(2y-x)
5:.-4a²b+12ab²-9b³
=-ab(4a+12b-9b²)
6:4/9m²+3/4mn+n²
=(2m/3+n)²
7:x²-y²-2y-1
=x²-(y²+2y+1)
=x²-(y+1)²
=(x+y+1)(x-y-1)
1年前
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