Mathematics
Senior High
254の(3)の問題で右辺は整っている形なのになぜc=-(a+b)をかけるんですか？
*(2) a+b+c=0 のとき
+
a
b
C
(3) a+b+c=0) a³+b³+c³=-3(b+c)(c+a)(a+b)
AUTT
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