已知x+y=4,x^2+y^2=10,求(x-y)^2

已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y 已知4x=9y求(1)x+y/y (2)y-x/2x 已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x/y=2,求2x(x+y)-y(x+y)/4x²-4xy+y² 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知x+y=4,x^2+y^2=10,求(x-y)^2 已知：4x^2+y^2-4x-6y+10=0,求y/x-x/y的值 已知2x-y=10,求式子[(x^2+y^2)-(x-y)^2+2y(x-y)]/4y (4xy-2y²)/4 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( 已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y 已知x^2+4y^2-4x+4y+5=0,求(y^4-x^4)/(y-2x)(x+y)*2x-y