333×369简便计算

Question

如题所述

Answer 1

333×369
=333×(3×123)
=999×123
=(1000-1)×123
=1000×123-123
=123000-123
=122877

Answer 2

1x9=9

12x99=1188 (1+8=9 两个9)
123x999(本题)=122877 (1+8=9,2+7=9 三个9）
1234x9999=12338766
..............................

Answer 3

333×369
=333*(3*123)
=999*123
=(1000-1)*123
=1000*123-123
=123000-123
=122999-123+1
=122876+1
=122877