x+y=22,5x+6y=22,x=?,y=?

6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 x+y=5; x^y+y^x=17 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 5x+4y=22 4x+y=3y+x 怎么解 {5x-2y=7y+2x 3x+2y=22 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 二元函数f(x,y)=x+y/x-y,求f(y/x,x/y) [x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 Y={X (-5 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20