Question

срочно 15 балоовввввввввв​

Answer 1

$1)\frac{1}{5}+\frac{3}{10}=\frac{2+3}{10}=\frac{5}{10}=\frac{1}{2}\\2)\frac{1}{2}-\frac{3}{10}=\frac{5-3}{10}=\frac{2}{10}=\frac{1}{5}\\3)1-\frac{3}{10}=\frac{10-3}{10}=\frac{7}{10} \\4)\frac{1}{3}+\frac{7}{10}=\frac{10+21}{30}=\frac{31}{30}=1\frac{1}{30}$