Question

104. x-i tapın. A) 6 B) 7 C) 8 D) 9 E) 10 B x+3 40° E A 15 x-1 C 9 40% >
xahiş kömek edinnn
pls helppp

Answer 1

Ответ:

х=7

Объяснение:

∆BEC~∆DAC, по углам.

CD/BC=AD/BE

9/(х-1)=15/(х+3)

15(х-1)=9(х+3)

15х-15=9х+27

15х-9х=27+15

6х=42

х=42/6

х=7