77乘以99再加99的简便计算

2025-03-18 23:50:56
推荐回答(2个)
回答1:

77×99+99
=(77+1)x99
=7722

回答2:

77×99+99

=(77+1)×(100—1)

=78×(100—1)

=78×100-78×1

=7800-78

=7722