1.x(x+1)-y(y+1)
2.x²+4y-1-4y²
3.36x³-12x²-x+1/3
4.x²-4xy+4y²-2x+4y-3
5.x²-2x-a²2a
6.a²-4ab+4b²-10a+20b+25
要过程!!!!!!!!!
1.x(x+1)-y(y+1)
2.x²+4y-1-4y²
3.36x³-12x²-x+1/3
4.x²-4xy+4y²-2x+4y-3
5.x²-2x-a²2a
6.a²-4ab+4b²-10a+20b+25
要过程!!!!!!!!!
1.x(x+1)-y(y+1)
=x²+x-y²-y
=x²-y²+x-y
=(x-y)(x+y)+(x-y)
=(x+y+1)(x-y)
2.x²+4y-1-4y²
=x²-(4y²+4y+1)
=x²-(2y+1)²
=[x-(2y+1)][x+(2y+1)]
=(x-2y-1)(x+2y+1)
3.36x³-12x²-x+1/3
=(36x³-12x²)-(x-1/3)
=12x(3x-1)-1/3(3x-1)
=(3x-1)(12x-1/3)
5.x²-2x-a²-2a
=(x²-a²)-2(x+a)
=(x+a)(x-a)-2(x+a)
=(x+a)(x-a-2)