1.169(a+b)²-121(a-b)²

问题描述:

1.169(a+b)²-121(a-b)²
2.(x-3)(x-5)+1
3.(2a-b)²+8ab
4.y²-2y-x²+1
5.x³+3x²-4x-12
6.6x²+5x-4
7.(x²-2x)²+2(x²-2x)+1
8.(x²+3x+3)(x²+3x+5)+1
9.(m+n)²-4(m+n-1)

1,(13a+13b+11a-11b)(13a+13b-11a+11b)=(24a+2b)(2a+24b)=4(12a+b)(a+12b)2,x²-8x+15+1=x²-8x+16=(x-4)²3,4a²-4ab+b²=8ab=4a²+4ab+b²=(2a+b)²4,y²-2y+1-x²=(y-1)...