跨境电商专业女生就业:请教几道数学问题！！急！！（初一的）

1.a^3+a^2-a-1=a^2(a+1)-(a+1)=(a+1)(a^2-1)=(a+1^2(a-1)
2.x^2-y^2-2x+1=(x-1)^2-y^2=(x+y-1)(x-y-1)
3.x^2-2x+2y-y^2=(x^2-y^2)+(2y-2x)=
(x+y)(x-y)-2(x-y)=(x-y)(x+y-2)
4.4a^2b^2-(a^2-b^2-c^2)^2
=(2ab)^2-(a^2-b^2-c^2)^2
=(a^2-b^2-c^2+2ab)(2ab-a^2+b^2+c^2)

1:(a的立方-1)+a的平方-a=(a-1)(a的平方+a+1)+a(a-1)=(a-1)(a的平方+2a+1)
2:x的平方-y的平方-2x+1=x的平方-2x+1-y的平方=(x-1)平方-y的平方=(x-1-y)(x-1+y)
3:x的平方-2x+2y-y的平方=x的平方-2x+2y-y的平方+1-1=x的平方-2x+1-(y的平方-2y+1)=(x-1)平方-(y-1)平方=(x-1-y+1)(x-1+y-1)
4:4a的平方b的平方-(a的平方-b的平方-c的平方)的平方
=(2ab-a的平方+b的平方+c的平方)(2ab+a的平方-b的平方-c的平方)

a³+а²-а-1=(а+1)²(а-1)
X²-Y²-2X+1=(X+Y-1)(X-Y-1)
X²-2X+2Y-Y²=(X-Y)(X+Y-2)
4а²b²-(а²-b²-c)²=(а²-b²+аb-c²)(2аb-а²+b²+c²)

a3+a2-a-1=a2(a+1)-(a+1)=(a+1)(a2-1)=(a+1)2(a-1)
x2-y2-2x+1=(x-1)2-y2=(x-1+y)(x-1-y)
x2-2x+2y-y2=(x+y)(x-y)-2(x+y)=(x+y)(x-y-2)
4a2b2-(a2-b2-c2)2=(2ab+a2-b2-c2)(2ab-a2+b2+c2)

a^3+a^2-a-1=a(a^2+2a+1)-(a^2+2a+1)=a(a+1)^2-(a+1)^2=(a-1)(a+1)^2
x^2-y^2-2x+1=(x^2-2x+1)-y^2=(x-1)^2-y^2=(x-1+y)(x-1-y)
x^2-2x+2y-y^2=x^2-2x+1-1+2y-y^2=(x^2-2x+1)-(y^2-2y+1)=(x-1)^2-(y-1)^2=(x-1+y-1)(x-1-y+1)=(x+y-2)(x-y)
4a^2 b^2-(a^2-b^2-c^2)^2=(2ab+a^2-b^2-c^2)(2ab-a^2+b^2+c^2)=[(a+b)^2-2b^2-c^2][2b^2+c^2-(a+b)^2]= -[(a+b)^2-2b^2-c^2]^2