数学题: 用简便方法计算:(1/5+2/9)×(3/10) 谢了啊!
问题描述:
数学题: 用简便方法计算:(1/5+2/9)×(3/10) 谢了啊!
答
(1/5+2/9)×(3/10)
=(1/5)×(3/10)+(2/9)×(3/10)
=3/50+1/15
=9/150+10/150
=19/150