Mathematics
Senior High
矢印の途中式教えてください🙏🏻
整理すると
これを解くと
(3a)2=22+a2-2･2･acos60°
8a2+2a-4=0
-
-1±√33
8
a=
-1+√33
>0であるから
a=
8
200
Answers
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