(x+y)=36 x-4=y+2 怎样算

若线段x ,y 满足[2x-3y]*[3x+2y]=0 则x/y=?怎样算出2x-3y=0或3x+2y=0 当2x-3y 已知X+Y=-4,怎样求二分之一X+Y-4X-Y+3X+Y-二分之三X+Y+X-Y的值 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20 {(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20 3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 已知4x=9y求(1)x+y/y (2)y-x/2x (x+y)(x+2y)(x+3y)(x+4y)=-40 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 3x+3y+2x-2y=36 4x+4y-5x-5y=2 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 解方程组