1.(x-y)(x+y)+(x-y)+(x+y)

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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)
=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

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