Mathematics
Senior High
Resolved
展開の問題なのですが、この解き方のどこが間違っていますか?
(14) (a+b+c)(a + bc)
(14)-(a-6-c) (a+b-c)
{a²-(--)²}
2
=
{a²-(6²_2bc+ (²)}
(a²-6²-c² +2bc
ce
- a² +6² +c²-2bc
2
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