Mathematics
Senior High
Resolved
①から②になる過程を教えてください
=a³+
(5) (a+b+c)(a+b-c)(a−b+c)(-a+b+c).
=((a+b)+c{(a+b)-c}>{c+(a-b)}{c-(a-b)}
={(a+b)-c2}{c²-(a - b)²}
414
=-(a+b)(a-b)²+{(a+b)²+(ab)}c²-c4-
=-((a+b)(a-b)}²+(a²+2ab+b²+a²-2ab+b²) c²-c4
=-(a2-62)²+(2a2+262) c²-c4
=-(a-2a2b2+64)+2a²c²+26²c²-c4
=-a-b-c+2a²b²+26²c²+2c2a²
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