5y=5x-10,求y...

已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知：4x = 5y,求(x+y) ：y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 2x+2y=10 x-y=5 求X,Y X+Y-Z=15 X+5Y+10Z=70 求：X、Y、Z (x+y-5)+|3y-2x+10|=0,求 x,y的值 求(X+Y)(X-Y)(X²+Y²),X=5 Y=2, (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 5y=5x-10,求y... 已知x+y=10,求[(x+y)^2-(x-y)^2-2y(x-y)]÷5y的值 1/x-1/y=x,求5y+xy-5y/y-xy-x=? 已知5x-4y=0,求x:y和x+y:y的值 {(x+y)/2+(x-y)/3=1,(x+y)-5(x-y)=2.求x=?,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 求微分方程y-10y'+25y=x^2e^（5x)的通解 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*y)的值 实数x,y满足|2分之5x-y|+y²-10y+25=0,求代数式1-x-2y分之x-y÷x平方-y平方分之x²-4xy+4y