若2x-y=2,则8x-4y+6=?的解析

若x^2+y^2-6x+8y+25=0 则y/x-x/y的值是 若实数X,Y满足X²+Y²+4X-2Y +1=0,则X²-6X+Y²-2Y的最大值是多少 若(x-y)/(x+y)=3 则(x+2y)/(6x-7y)等于 已知x.x+y.y+8x+6y+25=0,求代数式(x.x-4y.y)/(x.x+4xy+4y.y)-x/(x+2y)的值 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是（）?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8？(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8 x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 若x-2y=8,x+2y=6,则x的平方-4y的平方+2x-4y的值是 解方程组 10（x-y)=3(x+y)+15 6(x+y)=4(2x-y)+1610（x-y)=3(x+y)+156(x+y)=4(2x-y)+16分开的。 若5x+3y=3x+4y=x+2y+6,则x+y=___ 解方程组 x-y/3-x+y/4=2 x-y/6-x+y/8=3 解方程组8/(x+y) +(x-y)/2=3,6/(x+y)-(x-y)/4=1 若X+Y=8,(X-Y)^2=4,则X^2+Y^2= 已知|5x-y-8|+(7y-x+2)=0则4x+6y 若x²+y²+6x-2y+10=0 则分式x-2y/x³-4x²y+4xy²的值 若x+y=-6,求[(x+y)的2次方-(x-y)的2次方+2y(y-x)]乘以1分之4y 若直线y=3x+6与y=2x-4的交点坐标为（a,b）,则x=a,y=b是（）选项中方程组的解a.y-3x=6 b.y-3x=6 c.3x-y=6 d.3x-y=-62y+x=-4 2x-y=4 3x-y=4 2x-y=-4 若直线y=3x+6与y=2x-4的交点坐标为（a,b）,则x=a,y=b是（）选项中方程组的解选项：A.y-3x=6 B.y-3x=6 C.3x-y=6 D.3x-y=-62y-x=-4 2x-y=4 3x-y=4 2x-y=-4