计算：1.(-6y+x)(-6y-x) 2.(-6y+x)(6y-x) 3.(x+4y)(x-9y) 4.(-6y-x)

计算:(x-y)^2*(y-x)^2*(x-y)^6 1.（（y+2x)(-2x+y)+4(x+2y)^2)/3y 2.（2(x-y)^3-8(x-y）^2(x+y)+6y( (x-y)³+9(x-y)-6(x-y)² ｛4/(x+y)+6/(x-y)=3 ｛9/(x-y)-1/(x+y)=1 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 (x-y)x^6+(y-x)y^6因式分解 6(x+y)2-2(x-y)(x+y)因式分解 计算：（3x-4y）-[-（2y+x）+（x-3y）]-6x 1.计算(a^2+a+1)(a^2-a+1) 2.计算(x-y)(x+y)+(3x-2y)(2x+y)-x(6x-y) 已知x平方-6x+9与/y-1/互为相反数,计算(x/y-y/x)÷( x+y) (x+y)²+x+y-6因式分解 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1