tolong dibantu dong banh
1. AE = 3 cm, ED = 4 cm, AB = 14 cm, DC = 35 cm
[tex]ef = \frac{(ae \times dc) + (ed \times ab)}{ae + ed} \\ = \frac{(3 \times 35) + (4\times 14)}{3 + 4} \\ = \frac{105 +56 }{7} \\ = \frac{161}{7} \\ = 23 \: cm[/tex]
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