计算 [ ( x+y ) ( x-y ) ] ^ 9 ÷ ( y-x )^ 8 ÷ ( -x-y )^9

计算(-x-y)(y-x)+(-x-y)(x+y), 计算 (x²/x+y)-x-y 行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y | 计算(-x-y)² 计算:y-x分之x+y+x-y分之y-y-x分之2x-y 计算2x/x-y 计算 x(x-3y) 计算:(x+3y)(2x-y) 计算:(2x-3y)(x+y) 计算:(x+2y)(2x-y) 计算:(-x-2y) * (3x-y) 计算：(x+y)-3(x-2y). 计算:(x-y+9)(x+y-9) 计算（x+y-z)(x-y-z) 计算：(x-y+z)(-x+y+z) 计算：-(x+y)+(x-y) 要求： 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x 计算：[(x+y)(x-y)-(x-y)^2+2y(x-y)]/(-2y)