简便方法如下:0.36×1.5-0.45=0.36×1.5-1.5×0.3=1.5×(0.36-0.3)=1.5×0.06=0.09另一方法如下:0.36×1.5-0.45=0.36×(1+0.5)-0.45=0.36+0.18-0.45=0.54-0.45=0.09