468-(268+71)-29简便计算,278*15-78*15简便计算
问题描述:
468-(268+71)-29简便计算,278*15-78*15简便计算
答
468-(268+71)-29
=468-268-71-29
=468-268-(71+29)
=200-100
=100
278*15-78*15
=15*(278-78)
=15*200
=3000