{6/x+y+10/x-y=30 6/x+y-10/x-y=-1

{6/x+y+10/x-y=30 6/x+y-10/x-y=-1 (x+y)/6+(x-y)/10=1,(x+y)/6-(x-y)/10=5 x,y 满足x(x-2)-y(y-6)=-10,求x,y的值 y=-6/x (x 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y) 这道题真么做X Y 6 10 Y X如果（X+Y) (Y+X) =(X+6) ,且（X-Y)X+6(X-Y)=(X-Y) ,求X +Y 的值. X^2-Y^2+6X+10Y-30=0 X^2+Y^2-5X-8Y+21=0 X=?Y=? 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 6x^2(x-y)-10y(y-x)^2-2(y-x) 因式分解 2(x+y)-3(x-y)=1 6(x+y)+(x-y)=51 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 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 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)