(2x+y)^2-4x-2y-3=0怎么化简

4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? x^2-4xy+3y^2=（x-3y)(x-y)x^2-4xy+3y^2 怎么分解成（x-3y)(x-y) (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 二元一次方程(x+y)/2+(x-y)/3=6,4(x+y)-5(x-y)=2怎么算 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 x^2-4Y^2+X+3Y-1=0 2X-Y-1=0 怎么算 三元一次方程组x-2y=5,4x-y+3z,2x+y=0怎么解 (x+y)(x-y)+3y^2怎么做? 2x=y 3y=x怎么解 x-3y=2 y=x 怎么写 4x+2y-3x-y 简写怎么写? (X-Y)^2-4(X-Y)+3怎么做, 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 x*x+2x+y*y-4y+5=0 x= y= 2（x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15 {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1