Question

99×78+78用简便计算怎么样算

Answer 1

有个78可以加到99里就变成100*78
99*78+78
=100*78
=7800

Answer 2

 

Answer 3

 

Answer 4

 

Answer 5

=99×78+1×78=78×（99+1）=78×l00=7800