x+y=6 5x-22+6y=33.8

6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 已知x.x+y.y-6x-8y+25=0,求3x.x+5y的值 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 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 {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 ｛4/(x+y)+6/(x-y)=3 ｛9/(x-y)-1/(x+y)=1 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 {x=5y 3x+6y=42 5x=6y x比y=? 1.4Y=X 5X+6Y=39