Question

Simplify:

(7) $\frac{-9}{10}÷\frac{-9}{10}$

Answer 1

$$\begin{gathered} \frac{-9}{10}÷\frac{-9}{10} \\ =\frac{-9}{10}\times \frac{10}{9} \\ =\frac{1}{1}\times \frac{1}{1} \\ =1 \end{gathered}$$