Question

please explain it properly​

Answer 1

$\frac{a + b - c}{2a} .............(1) \\ where \: a = 5 \\ b = 7 \: and \: c = 2 \\ so \: fill \: these \: values \: in \: (1) \\ \frac{(5) + (7) - (2)}{2(5)} \\ = \frac{12 - 2}{10} \\ = \frac{10}{10} \\ = 1$

Hence, your answer is 1.

Answer 2

a+b-c/2a

=5+7-2/2×5

=12-2/10

=10/10

=1