2.5×0.6-1.8×0.5
=0.5×5×0.6-1.8×0.5
=0.5×3-1.8×0.5
=0.5×(3-1.8)
=0.5×1.2
=0.6那1。8乘以0.5那步怎么没有呢不用能不能吧这道题给我清楚的解释一下啊，我刚上四年级，有点看不懂。谢谢啦要不这样吧 2.5×0.6-1.8×0.5 =2.5×2×0.3-0.9×2×0.5 =5×0.3-0.9×1 =1.5-0.9 =0.6