运用等差数列公式=(首项+末项)×项数×1/2
(4+304)×101÷2=15554
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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