6X-Y=18 = Y-4X=22,X等于几,Y等于几

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 3/X+2/Y=6/1等介于?（X不等于18）A.x/3+y/2=1/6 B .3Y+2X C.X=18Y/Y-12 D .Y=12X/X-18 {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 4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 化简 x / y(x+y) - y / x(x+y) = x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 6x-2y+[5x-2(y-2x)+y],其中x=-2分之16x-2y+[5x-2(y-2x)+y]y=-6分之1 急 在线等x=-2分之1 y=x(x x+x+x+y=60 .x-y=4 8x十6y=144问x等几y等几? 若7x+6(x-y)=-4,3x-4(y-x)=18,则x-y=__ (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= y=-6/x (x 7x:4y,x:y=( ):(