Question

помогите пж пожалуйста​

Answer 1

$\displaystyle 1)2\frac{1}{5}+3\frac{2}{5}=(2+3)+(\frac{1}{5}+\frac{2}{5})=5+\frac{3}{5}=5\frac{3}{5}=\frac{28}{5}=5,6\\ \\2)13+2\frac{7}{9}=13+2+\frac{7}{9}=15+\frac{7}{9}=15\frac{7}{9}=\frac{142}{9}\\ \\3)17\frac{2}{9}+9\frac{4}{9}=(17+9)+(\frac{2}{9}+\frac{4}{9})=26+\frac{2}{3}=26\frac{2}{3}=\frac{80}{3}\\ \\4)3\frac{7}{12}+2\frac{3}{5}=(3+2)+(\frac{7}{12}+\frac{3}{5})=5+\frac{71}{60}=5+1\frac{11}{60}=5+1+\frac{11}{60}=6+\frac{11}{60}=\\\\6\frac{11}{60}=\frac{371}{60}$