若3x=5y,则x:y=________,(x-y):y=______

若3x=5y,则x:y=________,(x-y):y=______ 若x+y-3的绝对值与根号下2x+3y-5互为相反数则x=________,y=________ 若y=f(x^2),则y`=________ 若2x-y=2y-x=15,则x-y=________. 若|3x+2y+7|+|5x-2y+1|=0则x=_______y=________ 若x^2+y^2=1,则3x-4y的最小值是________. x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? C语言：int x=5,y=7,z; z=x>y?5>3?++x+y:x:++x-y++ 则z的值为________. x+y=5,xy=-3,则x^2y+xy^2=____x^2+y^2=________ 1、若x+y=6,xy=3,则xy^2+x^2y的值为________.2、若x^2+y=3,x^4+x^2y=27,则x=________. 已知(2y-x)/(7x+5y)=2/3且y不等于0,则x/y=________.只要最后的答案就行了 如果x的平方-y的平方=20,x+y=-5,则x-y的值是________ 若(x+y-7)^2+|x^2-y^2-56|=0,则x-y的值为________ 已知4x-5y=0,则(x+y) :(x -y)的值为________.rt 已知x+4y-3z=0 4x-5y+2z=0(xyz≠0) 则x:(-2x):3y 为________. 若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y＝ x^2+y^2=25,x+y=7,且x>y,则x-y的值等于________ 若(4x-3)的平方+ 2y+1的绝对值=0,则x+2y=________.