Question

(a+7b+12)/(a+5b+10) если a/b=5

Answer 1

$\frac{a+7b+12}{a+5b+10} ,esli \frac{a}{b} =5;a=5b \\ \\ \frac{5b+7b+12}{5b+5b+10}= \frac{12b+12}{10b+10} = \frac{12(b+1)}{10(b+1)} = \frac{12}{10} =1.2$