(x+y)(x-y)+4(y-1)

(x+y)(x-y)+4(y-1) （x+y)²-4(x+y-1) 因式分解:(x+y)-4(x+y-1) x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 把4（x-y+1)+y(y-2x)因式分解 因式分解:(x+y)(x-y)+4(y-1) y(y+2)+4x(x-y-1)因式分解是多少 {(x,y) |x|+|y| x>y?x:y {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1 {3(x+y)+3(y+x)=1,3(x+y)+4(y-x)=-1 把(x+y),(x-y)个作为一个整体合并同类项1,7(x+y)-2(x+y)-4(x+y)+2(x+y)2,(x-y)²＋2(x-y)－(x-y)－2(x-y)² [(x+y)(x-y)-(x-y)²+2y(x-y)]÷4y [(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y 计算:(4xy(x-y)^-1+(x(y^-1)-(x^-1)y)/((x^-1)+(y^-1)))*(x+y)^-2 x+y+2(-x-y+1)=3(1-y-x)-4-(y+x-1),x+y=? 已知x×x×y×y+x×x+y×y+1=4xy,求x,y的值快 x(x-y)+4(y-x)因式分解