145+146+147+148+149+150+151+152+153怎么用简便法算
问题描述:
145+146+147+148+149+150+151+152+153怎么用简便法算
答
=(145+153)+(146+152)+(147+151)+(148+150)+149=149x9=1341
145+146+147+148+149+150+151+152+153怎么用简便法算
=(145+153)+(146+152)+(147+151)+(148+150)+149=149x9=1341