1. Решите уравнение: б) 11 1/5 : 7 = 10 1/2 : x.

б) 11 \(\frac{1}{5}\) : 7 = 10 \(\frac{1}{2}\) : x.
\(\frac{56}{5}\) : 7 = \(\frac{21}{2}\) : x
\(\frac{56}{5*7}\) = \(\frac{21}{2x}\)
\(\frac{8}{5}\) = \(\frac{21}{2x}\)
8 * 2x = 21 * 5
16x = 105
x = \(\frac{105}{16}\)
x = 6.5625