Mathematics
Senior High
2段目から3段目の1/4になる理由がわかりません。教えてください🙇🏻♀️
2
(1+R₂)² - (1+R)² = (1+ R₁ ±R₂ )² = (1+√(1+R₁) (1+R₂) -
=
2
2
{(1+R₁)+(1+R₂)}² (√(1+R₁)(1+R₂))²
2
={(1+R₁)²+2(1+R) (1+R₂)+(1+R₂)"}
4
-(1+R₁) (1+R₂)
=
{(1+R)-2(1+R)(1+R₂)+(1+R₂)"}
(1={(1+R)-(1+R)}()
≥ O
Answers
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ありがとうございます