Mathematics
Senior High
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(2)の解き方がわかりません
2枚目の写真のように解いたのですが答えが合いませんでした😢
(2)(a+b+c)-(a-b-c)2
(4) (x+y) (x-y)(x2+xy+y2)(x²-xy+y2)
(2) (a+b+c)²-(a-b-c)
(b+c+α)² + (b>+C-A)²
=
=
2
b+c= A
A² +2aA ta² + A²- zaA+az
ZA² +242
262 +4bc + 2 C²+ Za ~
2a2+262 + 2 c² + 4 b c
4ab +4ac
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ありがとうございます‼︎