Đáp án:
DE=19,2
Giải thích các bước giải:
Xét ΔAED và ΔABC có:
- ∠A1=∠A2
- ∠D=∠C
⇒ΔAED đồng dạng vs ΔABC
⇒DE/BC = AD/AC hay DE/9,6=10/5
⇒DE=9,6.10:5=19,2
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