Question

79×99+79，用简便的方法计算

Answer 1

=79×99+79×1 =79×(99+1) =79×100 =7900

Answer 2

=79×（99+1）
=79×100
=7900

Answer 3

79×(99+1)=79×100=7900

Answer 4

79×99+79×1
=79×(99+1)
=7900

Answer 5

=79×(99+1)
=79×100
=7900