_25=5² なので、根号から出す時の為に取っておきます、
(1/2)√(25✕9-225/4)=(1/2)√{25✕9-(25✕9)/4}
=(1/2)√{25✕9✕1-(25✕9✕1)/4}
=(1/2)√{(25✕9)✕(1-1/4)}
=(1/2)√{5²✕3²✕(4/4-1/4)}
={(1/2)✕5✕3}√(3/4)
=(15/2)√(3/2²)
=(15/2)✕(1/2)√3
=(15/4)√3。
Mathematics
Senior High
矢印の式変形の過程を教えて頂きたいです🙏🏻
(2)
2
AOAB=√|OA|·|OB – (OA • OB)³
-/12v / 25-9-225
4
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= 15√√3.
Answers
1/2√(900/4-225/4)
=1/2√(675/4)
=1/2√(3^3×(5^2)/2^2)
=1/2×3×5×1/2×√3
=15/4√3
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