求X.Y 3(x+10)=8y-50 5x=10y+40步骤越详细越好,

已知:3x-5y=0,求x/y,x-y/y,x-y/x 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 求几个方程组的答案 ｛2x+y=2 {3x-y=7 x=?y=?{x+2y=50 {3x=2y+6 x=?y=?{x+y=40 {10x+8y=370 x、y=?{x+y=5.8 {y=3x+0.6 x=?y=? 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 y=x^3-5x^2+2x-8 求y^2求y撇 X+Y-8X+10Y+41=O,求X/Y-Y/X的值 (x+y)(x+y-10)+25=0,且x-y=3,求x,y (x+y)(x+y-10)+25=0,且x-y=3,求x,y (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 6x-2y=5 8x-3y=-5 求x,y 求x:y:z x:y=7/5:7/3,y:x=7:8 x+y=8 2x-y=1 求3x+5y 已知7Y=X-3,8Y=X+5 求X和Y 3(x-5)-8y=-x-(-0.5y)=7,求x,y的值 (x+y-5)+|3y-2x+10|=0,求 x,y的值 (4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian 已知x-2y=2016,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以8x的值 已知x-2y=2012,求[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]/(8x))