-a²-4b²+4ab=?(分解因式,
问题描述：
-a²-4b²+4ab=?(分解因式,
1.-a²-4b²+4ab=?
2.(x-y)²-10(x-y)+25=?
3.(x²-1)²+6(1-x²)+9=?
4.4(x+y)²-20(x+y)+25=?
5.1/4x²+x+1=?
6.(3x-5y)²+2(3x-5y)+1=?
7.4(2x-y)²+24(2x-y)+36=?
8.(2x-5)²+28x-21=?
(分解因式,
答
1.-a²-4b²+4ab=-(a^2-4ab+4b^2)=-(a-2b)^22.(x-y)²-10(x-y)+25=(x-y)^2-2*5(x-y)+5^2=(x-y-5)^23.(x²-1)²+6(1-x²)+9 =(x^2-1)^2-2*3(x^2-1)+3^2=(x^-1-3)^2=(x^2-4)^2=(x+2)^2(x-2)^2...