Question

(-1/4)² -3/7.[1/6-(-1/2)³]

Answer 1

$(-\frac{1}{4})^2 -\frac{3}{7}.[\frac{1}{6}-(-\frac{1}{2})^3]= \\ \\ \frac{1}{16}-\frac{3}{7}.[\frac{1}{6}+\frac{1}{27}]= \\ \\ \frac{1}{16}-\frac{3}{7}.\frac{11}{54}= \\ \\ \boxed{\frac{1}{6}-\frac{33}{378}=\frac{5}{63}}$