(2x-4y-6)2=-|3x+2y-17|则x=——,y=——

3(x+y)—4(x-y)=4,(x+y/2)+(x-y/6)=1.解方程组 x²-2x+y²+6y+10=0,求—9(x+y)²+(3x-2y)(2y+3x)的值 [(2x—y)(2x+y)—y(y—6x)]除以2x=多少 {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 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 已知x²+4y+y²—6y+13=0,求2x+3y的值 若{3x-2y=17 则{x+y=———— 2x-3y=13 x-y=———— 已知方程组{3x+2y=17 2x+3y=16 则x+y=————— x-y= 先化简,再求值.其中x=-2,y=二分之一 {(x+y)2—(x+y)(x+3Y)—5Y平方}除2y