0.485乘102减48.5等于? (简便计算)

题目

0.485乘102减48.5等于? (简便计算)
好期待答案的~~~

答案

0.485*102-48.5
=48.5*1.02-48.5
=48.5*(1.02-1)
=48.5*0.02
=0.97