计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2

计算(x-y)^7÷(y-x)^6+9-x-y)^3÷(x+y)^2 计算：(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2 (x-y)7÷(x-y)6计算 已知x平方-6x+9与/y-1/互为相反数,计算(x/y-y/x)÷( x+y) (-y²/3x)³÷6x²y^7÷(-1/9x²y)² 计算 计算：(x—y)^7÷(y—x)^6+(—x—y)^3÷(x+y)^2 计算 [ ( x+y ) ( x-y ) ] ^ 9 ÷ ( y-x )^ 8 ÷ ( -x-y )^9 计算.3(x-y)²/(y-x)³·(x-y)²÷9/y-x 计算或化简：[（x-y）/(x+3y)]÷[（x²-y²）/(x²+6xy+9y²)]-（2y）/x+y 计算:(x-y+9)(x+y-9) 计算：1.（x-1)^2+2(1-x) 2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y）1.（x-1)^2+2(1-x)2.(x-y)/(x+3y)÷(x^2-y^2)/(x^2+6xy+9y^2)-2y/(x+y） 计算：(x-y)^8÷(y-x)^4×(x-y) 计算:(x-y)^2*(y-x)^2*(x-y)^6 计算 （x-2y)^6÷（2y-x)^5 3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算 计算：[(x+2y)(x-2y)+(x-2y)^2]÷(6x) 计算.2x÷x/5x+3y^2-4y+4/2y-6·1/y+3÷12-6y/9-y^2 (1)计算：a-(a^2)/(a+1)-1 (2)计算：3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)(3)计算：x(2-1/x)+x/x^2-2x*(x^2-4)(4)计算：(x-3)/(2x-4)÷(5/x-2--2)(5)计算：m/m+3-6/9-m^2÷2/m-3(6)计算：(3a/a-3-a/a+3)*a^2-9/a