2x-5-2y=-5x+3y-2求x 二分之三x-3-2y=-3x+二分之一y+1求y

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 3x十5y二7 2x二4 求x y (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 当2y-x=5时,求5（x-2y)的二次方-3（-x+2y)-100 已知|2x+y|+ (3x-11y-5)的二次方=0求x,y. {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,y=? 三分之x-2y-二分之x+2y=-1,5(x-2y)-4(x+2y)=-1求x和y的值 解方程组:{二分之x+y+二分之x-y=6,4(x+y)-5(x-y)=2() 已知关于x,y是有理数,且满足(2x-y+1)的二次方+|5x-2y-3|=0.求x,y的值 5X+Y=3 X+5Y=2 求x和y.5X+Y=3X+5Y=2求x和y. 求(X+Y)(X-Y)(X²+Y²),X=5 Y=2, | x-y+5|与[x+y-13]的二次方,互为相反数,求3X+2Y的值 当2x-y=5时,求-(2x-y)的二次方+3(2x-y)-二分之一(2x-y)+3(2x-y)的二次方的值. 若x-y/x+y=5,求x-y/2x+2y+5x+5y/3x-3y的值 若x+y分之x-y=3,求式子x+y分之5(x-y)—2(x-y)分之x+y的值 若x-y分之x+y=3,求式子x+y分之5(x-y)—2（x-y）分之x+y的值 y=x^3-5x^2+2x-8 求y^2求y撇 6x+5Y=31 2X+3Y=17求X求 Y