y=3x和5x+6y=46{y=3x 5x+6y=46怎么解

（x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x |x|=3 |y|=5 |x-y|=|x|+|y| 求 X+Y和 X-Y 等于多少 x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 5X+Y=3 X+5Y=2 求x和y.5X+Y=3X+5Y=2求x和y. x+y=1 5x-2y=8 3x-y=7 2x-y=3x表示y和用y表示x 5 x=3 y,x和y成()比例 若5:x=3:y,那么x和y （5x+3y)(3y-5x)-(4x-y)(4y+x)= 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) 已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy) 3x+5y-(x+y)=6 2(x+y)-3x=-7 先化简再求值(x-y)(x-2y)+(x-2y)(x-3y)-2(x-3y)(x-4y) x=4 y=5