4+7+10+13+····301+304
问题描述:
4+7+10+13+····301+304
简便计算
答
运用等差数列公式=(首项+末项)×项数×1/2
(4+304)×101÷2=15554
师范附小李为您解答~
如果您满意请按下采纳,您的采纳是我前进的动力~低等式(304-4)÷3+1
=300÷3+1
=101
(4+304)×101÷2
=308×101÷2
=31108÷2
=15554