Question

77乘以99加78简便计算？

Answer 1

=77*（100-1）+78
=77*100-77*1+78
=7700-77+78
=7700+1
=7701

Answer 2

77×99＋78
＝77×99＋77＋1
＝77×（99＋1）＋1
＝77×100＋1
＝7700＋1
＝7701