60=x*y+5x+5y求x和y

|x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少 已知x+y=-5,x*x+y*y=19求xy和（x-y)*(x-y)的值 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=-5,x*x*x+y*y=19,求xy和(x-y)的值 已知：4x = 5y,求(x+y) ：y 3x+2y=5 3y+2x=5 求x和y 已知有理数X和Y,满足|X-Y|+|Y-5|=0,求3X-9Y的值 已知5x-4y=0,求Y分之X和Y分之X+Y的值 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y* 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 x+y=5; x^y+y^x=17