Mathematics
Junior High
Resolved
a³+b³が(a+b)³~になるのが理解できません。
なぜそうなるのですか?
2
5
2
(5) 解と係数の関係より
a+b=2、ab=-1
a³ + b³ = (a + b)³ - 3a²b
=(a+b)3-3ab (a + h)
3ab²
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