简单计算题842减305 385减174减26 201乘以26 45乘以98。

=842-(300+5)

=842-300-5

=542-5

=537

385-174-26

=385-(174+26)

=385-200

=185

201×26

=(200+1)×26

=200×26+1×26

=520+26

=546

45×98

=45×(100-2)

=45×100-45×2

=4500-90

=4410