Question

5².45+5².83-28.5²

Answer 1

\(=5^2.\left(45+83\right)-28.5^2=5^2.128-28.5^2=5^2\left(128-28\right)=5^2.100=2500\)

Answer 2

\(5^2.45+5^2.83-28.5^2\)

\(=5^2\left(45+83-18\right)\)

\(=25\times100\)

\(=2500\)

Answer 3

\(5^2.45+5^2.83-28.5^2\)

\(=5^2.\left(45+83-28\right)\)

\(=5^2.100\)

\(=25.100\)

\(=2500\)