15×12简便

2024-12-02 14:56:38
推荐回答(4个)
回答1:

15×12简便
解:采用拆分法,
15x12
=15x2x6
=30x6
=180

回答2:

=15X10+15×2
=150+30
=180

回答3:

=15x2x6

=30x6
=180

回答4:

3x5x3x4=3x3x5x4=9x20=180