Mathematics
Junior High
Solved
この式でなぜ6xになるかがわかりません
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数学(展開②・4つの公式)
(a+b)=@a²+2ab+b2
(a=b)²=a=2ab+b2
(a+b) (a-b)=③ a-62
(x+a)(x+b)=1x+(a+b)x+ab
⑤(x+3)=x^+6x+9
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