Question

resolva e coloque a conta:

°9/4 = x+2/x-3
°x+5/x = 10/8

Answer 1

$\frac{9}{4} = \frac{x+2}{x-3} \\ \\ 9*(x-3)=4*(x+2) \\ 9x-27=4x+8 \\ 9x-4x=8+27 \\ 5x=35 \\ \\ x=7 \\ \\ ------------------ \\ \\ \frac{x+5}{x} = \frac{10}{8} \\ \\ 8*(x+5)=10x \\ 8x+40=10x \\ 40=2x \\ \\ x=20$

Basta multiplica cruzado.