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

468-(268+71)-29
=(468-268)-(71+29)
=200-100
=100
278*15-78*15
=(278-78)x15
=200x15
=3000

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