Предмет: Математика, автор: olgatarasiuk

1.11 распишите полностью, пожалуйста

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Автор ответа: Lire

ㄴacb=ㄴdce
Δabc~Δcde( по двум углам)
ab:de=ac:cd=3:4
18:cd=3:4
cd=24

Автор ответа: tpieson

ΔACB подобен ΔDCE (по углам BAC=EDC из условия на рис. и ACB=DCE как вертикальные)=> $\frac{AC}{DC}= \frac{AB}{DE}; \frac{18}{x}= \frac{15}{20}; \frac{18}{x}= \frac{3}{4}; x= \frac{18*4}{3}=24$

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