`\text {@Luffy Cat}`
c,$\frac{1}{7}$ : $\frac{5}{17}$ + $\frac{1}{7}$ : $\frac{5}{18}$
=$\frac{1}{7}$ . $\frac{17}{5}$ + $\frac{1}{7}$ . $\frac{18}{5}$
=$\frac{1}{7}$ . ( $\frac{17}{5}$ + $\frac{18}{5}$)
=$\frac{1}{7}$ . $\frac{35}{5}$
=$\frac{1}{7}$ . 7
=1
b,4$\frac{5}{6}$ + $\frac{1}{6}$.(12 - 5$\frac{1}{3}$)
= $\frac{29}{6}$ + $\frac{1}{6}$ . $\frac{20}{3}$
= $\frac{29}{6}$ + $\frac{10}{9}$
=$\frac{107}{18}$
d,$\frac{(9,45-3,2)x4:0,2}{(0,297+0,721)x625}$
= $\frac{6,25x4x5}{1,018x625}$
= $\frac{25 x 5 }{1,018x5x125}$
= $\frac{125}{5,09x125}$
=$\frac{1}{5,09}$
