Mathematics
Senior High
赤の途中式からその次の(x³+1)(x³-1)になるのはなぜですか？
(6) (x+1)(x-1)(x²+x+1)(x2-x+1)
-
=
{(x+1)(x2-x+1)}{(x-1)(x²+x+1)}
= (x³+1)(x³-1)
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