Question

Tính

\(\frac{63^2-47^2}{215^2-105^2}\)

Answer 1

\(\frac{63^2-47^2}{215^2-105^2}\)

\(=\frac{\left(63-47\right)\left(63+47\right)}{\left(215-105\right)\left(215+105\right)}\)

\(=\frac{16.110}{110.320}\)

\(=\frac{16}{320}=\frac{1}{20}\)

Answer 2

\(\frac{63^2-47^2}{215^2-105^2}\)

\(=\frac{\left(63-47\right)\left(63+47\right)}{\left(215-105\right)\left(215+105\right)}\)

\(=\frac{16\cdot110}{110\cdot320}\)

\(=\frac{1}{20}\)