Помогите пожалуйста №462(1,2,3),№463(2,4)

462. 1)a²-b²-a+b= (a-b)(a+b)-(a-b)=(a-b)(a+b-1) 2)a²-b²-a+b=(a-b)(a+b)-(a-b)=(a-b)(a+b-1) 3) x³-x²y-xy²+y³=x²(x-y)-y²(x-y)=(x-y)(x²-y²)=(x-y)(x-y)(x+y)=(x+y)(x-y)^2 463 2) (a-b)³-3(a-b)²= (a-b)²(a-b-3) 4) (x+y)³+2x(x+y)²=(x+y)²(x+y+2x)=(3x+y)(x+y)^2