{2x+6y=8;{2x+y=5怎么算

二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y怎么解 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? y-x/7-x+y/6=1/2 5(x+y)-2(y-x)=1怎么解答 {2x+6y=8;{2x+y=5怎么算 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 3x*5y+2x*6y=2.7*(3x+2x)怎么解 |x-y+2|=|x+y+2|怎么算? x+y/2+x-y/6=5 2(x+y)-3(x-y)=-2 {6(x-y)-7(x+y)=21 {2(x-y)-5(x+y)=-1 6(x-y)-2(x+y)=14 3(x-y)+(x+y)=5 2x-y=8 3x+2y=5与3x+2y=1 3x-4y=-11用加减法怎么算? 2y''+5y'=x的通解怎么算 {x+y=1 ,xy=-6{x(2x-3)=0,y=x²-1{(3x+4y-3)(3x+4y+3)=0,3x+2y=5{(x-y+2)(x+y)=0,x²+y²=8{(x+y)((x+y-1)=0,(x-y)(x-y-1)=0 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)