30+33+36+39+……99等于几?
问题描述：
30+33+36+39+……99等于几?
答
1548
答
30+33+36+39+.+99=(30+99)×[(99-30)÷3+1]÷2=1548
30+33+36+39+……99等于几?
1548
30+33+36+39+.+99=(30+99)×[(99-30)÷3+1]÷2=1548