Evaluate
\begin{aligned}
\frac{2.39^2 - 1.61^2}{2.39 - 1.61}
\end{aligned}

Answer: Option D

Explanation:

As per given equation we can solve like this :

\begin{aligned}
= \frac{8 - 2.8}{1.3} \\
= \frac{5.2}{1.3} = \frac{52}{13} \\
= 4
\end{aligned}

Answer: Option C

Explanation:

Use following formula to solve it quickly
\begin{aligned}
\frac{a^2-b^2}{a-b}=\frac{(a+b)(a-b)}{(a-b)} = (a+b)
\end{aligned}
= (2.39+1.61) = 4

Answer: Option B

Explanation:

Just we need to take care to put decimal under decimal, rest add in a simple way

Answer: Option A

Answer: Option B

Explanation:

\begin{aligned}
0.5\overline{6} = \frac {56 - 5}{90} = \frac {51}{90}
\end{aligned}