Answers
x⁶-y⁶
=(x³)²-(y³)²
=(x³+y³)(x³-y³)
=(x+y)(x²-xy+y²)×(x-y)(x²+xy+y²)
=(x+y)(x-y)(x²-xy+y²)(x²+xy+y²)
参考・概略です
x⁶-y⁶
●x³,y³をひとまとまりと考える
=(x³)²-(y³)²
●公式:公式a²-b²=(a+b)(a-b)を考える
={(x³)+(y³)}{(x³)-(y³)}
●公式a³+b³=(a+b)(a²-ab+b²)を考える
●公式a³-b³=(a-b)(a²+ab+b²)を考える
={(x+y)(x²-xy+y²)}{(x-y)(x²+xy+y²)}
●整理
=(x+y)(x-y)(x²+xy+y²)(x²-xy+y²)
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