c

x : 7 = 5 dư 2

x      = 7 . 5 + 2

x      = 37

vậy x =  37

Tính:

$$\begin{gathered} a)\frac{1}{2}+\frac{2}{3}+\frac{3}{5}= \frac{15}{30}+\frac{20}{30}+\frac{18}{30} b)\frac{3}{8}+\frac{3}{4}+\frac{1}{16}= \frac{6}{16}+\frac{12}{16}+\frac{1}{16} \\ = \frac{53}{30} = \frac{19}{16} \\ c)\frac{2}{5}+\frac{3}{10}+\frac{28}{35}+\frac{3}{2}= \frac{2}{5}+\frac{28}{35}+\frac{3}{10}+\frac{3}{2} \\ =\frac{14}{35}+\frac{28}{35}+\frac{3}{10}+\frac{15}{10} \\ =\frac{6}{5}+\frac{9}{5} \\ =\frac{15}{5}=3 \end{gathered}$$

9175,2 : 8,3 = 91752 : 83 = 237.975903614