1.(x-y)(x+y)+(x-y)+(x+y)2.x(x+2)-(x+1)(x-1),其中x=-二分之一请写清步骤,结果.

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1.(x-y)(x+y)+(x-y)+(x+y)2.x(x+2)-(x+1)(x-1),其中x=-二分之一请写清步骤,结果.

1.(x-y)(x+y)+(x-y)+(x+y)2.x(x+2)-(x+1)(x-1),其中x=-二分之一请写清步骤,结果.
1.(x-y)(x+y)+(x-y)+(x+y)
2.x(x+2)-(x+1)(x-1),其中x=-二分之一
请写清步骤,结果.

1.(x-y)(x+y)+(x-y)+(x+y)2.x(x+2)-(x+1)(x-1),其中x=-二分之一请写清步骤,结果.
1.(x-y)(x+y)+(x-y)+(x+y)
=x²-y²+x²-y²
=2x²-2y²
2.x(x+2)-(x+1)(x-1)
=x²+2x—（x²-1）
=x²+2x-x²+1
=2x+1
=2×1/2+1
=2

1原式=x^2-y^2+x^2-y^2=2x^2-2y^2
2:x^2+2x-(x^2-1)
=x^2+2x-x^2+1
=2x+1

1.-y)(x+y)+(x-y)+(x+y)
等于 x2-y2+2x
2.等于x2+2x-x2+1

x^2-y^2+x-y+x+y=x^2+y^2+2x
x^2+2x-(x^2-1)=2X+1

{(x,y) |x|+|y| x>y?x:y x^/y-x-y^/y-x化简. 化简x(y-x)-y(x-y) 行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y | y/(x+y)-x/(x-y) x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 感激不尽1.x,y满足(x-y-1)(x+y) x y x+yy x+y xx+y x y (3x-y)(3y+x)-(x-y)(x+y) 化简x/y(x+y)-y/x(x+y) 化简 x / y(x+y) - y / x(x+y) = 化简:(x+ y)(x-y) +(x+ y) +(x-y) x+y (x+y) |x+y| x y x+yy x+y xx+y x y 化简y(x+y)+(x+y)(x-y)-x^2