Question

только под б) пж !!!!!!!!

Answer 1

$11 frac{1}{5} :7 = 10 frac{1}{2} :x \ \ 11 frac{1}{5} x = 7 * 10frac{1}{2} \ \ x= frac{7*21*5}{1*2*56} = frac{1*21*5}{1*2*8} = frac{105}{16} \ \ x=6 frac{9}{16}$

Проверим:
$11 frac{1}{5} :7 = 10 frac{1}{2} :6 frac{9}{16} \ \ frac{56*1}{5*7} = frac{21*16}{2*105} \ \ frac{8*1}{5*1} = frac{1*8}{1*5} \ \ 1 frac{3}{5} = 1 frac{3}{5}$