Mathematics
Senior High

(a+b+c)³を途中式を含めて教えてください🙇🏻‍♀️

Answers

a+b=xとおく
(x+c)³=x³+3x²c+3xc²+c³
x³=(a+b)³=a³+3a²b+3ab²+b³
x²=(a+b)²=a²+2ab+b²
(a+b+c)³=a³+3a²b+3ab²+b³+3a²c+6abc+3b²c+3ac²+3bc²+c³

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