如题所述
第1个回答 2018-05-29
19×15×9
=20x15x9-1x15x9
=300x9-15x10+15x1
=2700-150+15
=2550+15
=2565追问
=20x15x9-1x15x9
=300x9-15x10+15x1
=2700-150+15
=2550+15
=2565追问
2565
本回答被网友采纳第2个回答 2018-05-29
19×15×9
=285×9
=2565
=285×9
=2565