数学的2道判断题1.(x+y)^-6=x-2+2xy+y-22.(x^-1+y^-1)^2=x^-2+2x^-1y^-1

已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+x(xy+y)的值 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2 1、x(x-y)(x+y)-x(x+y)^2 已知x+y=-1,xy=-2,求代数式-5（x+y)+(x-y)+2(xy+y)的值 已知X+Y=-1,xy=-2,求代数式-5(x+y)+(x-y)+(xy+y)的值 4/X+1/Y=2,XY=-1,求代数式4Y-X/X-2Y/（x+2y-12Y²/x-2y)的值 先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y x+y)(x-y)+(x-y)^2-(6x^2y-2xy^2)/2y,其中x=-2,y=1/3 9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y的平方(x-y)(x+1),因式分解 (x+y-2xy)(x+y-2)+(1-xy)² 先化简,再求值(x-y/x+y)^2÷(y-x/x^2+2xy+y^2)^2*1/x+y,其中x=-4,y=1