Question

Tính nhanh:
145.(14-23)+45.(23-14)

Answer 1

\(145\left(14-23\right)+45\left(23-14\right)=145.14-145.23+45.23-45.14.\)

\(14\left(145-45\right)-23\left(145-45\right)=14.100-23.100=100\left(14-23\right)\)

\(=100.-9=-900\)

Answer 2

=145.(-9)+45.9

=-145.9+45.9

=9.(145+45)

=9.190

=1710