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✨ Jawaban Terbaik ✨

AD=2AB/3+AC/3
|AD|²=|2AB/3+AC/3|²
s²=4c²/9+(4AB•AC)/9+b²/9
=4c²/9+(4×b×c×cos60°)/9+b²/9
=4c²/9+2bc/9+b²/9

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