化简：(a+1)²-2(a+1)(a-1)-6
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化简：(a+1)²-2(a+1)(a-1)-6化简：(a+1)²-2(a+1)(a-1)-6化简：(a+1)²-2(a+1)(a-1)-6：(a+1)²-2(a
化简：(a+1)²-2(a+1)(a-1)-6
化简：(a+1)²-2(a+1)(a-1)-6
化简：(a+1)²-2(a+1)(a-1)-6
：(a+1)²-2(a+1)(a-1)-6
=a^2+2a+1-2a^2+2-6
=-a^2+2a-3