23*13.5-13.5
=13.5*(23-1)
=13.5*22
=297
望采纳,谢谢
解:原式=13.5x(23-1)
=13.5x22
=13.5x(20+2)
=13.5x20+13.5ⅹ2
=270+27
=297
简便计算过程如下
23×13.5-13.5
=23×13.5-1×13.5
=(23-1)×13.5
=22×13.5
=297
望采纳
13.5*(23-1)
=13.5*22
=13.5*(20+2)
=13.5*20+13.5*2 (此步骤为了方便口算)
=270+27
=297
(23-1)*13.5=22*13.5=297