计算: (1)(x-1)(x+1)=x²-1, (x-1)(x²+x+1)=x³-1

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计算: (1)(x-1)(x+1)=x²-1, (x-1)(x²+x+1)=x³-1

计算: (1)(x-1)(x+1)=x²-1, (x-1)(x²+x+1)=x³-1
计算: (1)(x-1)(x+1)=x²-1, (x-1)(x²+x+1)=x³-1

计算: (1)(x-1)(x+1)=x²-1, (x-1)(x²+x+1)=x³-1
(x-1)(x+1)
=x(x+1)-(x+1)
=x²+x-x-1
=x²-1
(x-1)(x²+x+1)
=x(x²+x+1)-(x²+x+1)
=x³+x²+x-x²-x-1
=x³-1
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