几道七年级数学题！！！急！！

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)

〈x y)(x—y—1) 有问题请追问

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