Question

Помогите решить номер 4!

Answer 1

$a); ; (m-frac{3}{7}):1frac{1}{5}=3,5\\m-frac{3}{7}=3,5cdot frac{6}{5}\\m-frac{3}{7}=frac{35}{10}cdot frac{6}{5}\\m-frac{3}{7}=frac{7cdot 3}{5}\\m=frac{21}{5}+frac{3}{7}\\m=frac{21cdot 7+3cdot 5}{35}\\m=frac{162}{35}=4frac{22}{35}\\b); ; (2,3-m):frac{3}{5}=0,12\\2,3-m=0,12cdot frac{3}{5}\\2,3-m=frac{12}{100}cdot frac{3}{5}\\2,3-m=frac{9}{125}\\m=2,3-frac{9}{125}=frac{23}{10}-frac{9}{125}=frac{23cdot 25-9cdot 2}{250}=frac{557}{250}=2,228$