Question

Tính nhanh

77² + 23² + 77 * 46

Answer 1

Ta có:\(77^2+23^2+77.46\)

\(=77^2+2.23.77+23^2\)

\(=\left(77+23\right)^2\)

\(=100^2=10000\)

Answer 2

=77*77+23*23+77*46

=77*(77+46)+23*23

=77*123+23*23

=9471+529

=1000