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apoper114dolce 9 月 22 日 上午 2:57 
Problem: Prove that the sum of the first n positive integers can be expressed as:

n(n+1)/2

Prove:

1 + 2 + 3 + ... + n = n(n+1)/2
apoper114dolce 9 月 20 日 上午 2:49 
⠀⠀⠀⠀:bombgd::bombgd::bombgd::bombgd:
⠀⠀⠀⠀:bombgd::starsky::invade::bombgd:
⠀⠀⠀⠀:bombgd::invade::starsky::bombgd:
⠀⠀⠀⠀:bombgd::starsky::invade::bombgd:
:bombgd::bombgd::bombgd::invade::starsky::bombgd::bombgd::bombgd:
:bombgd::starsky::invade::starsky::invade::starsky::invade::bombgd:
:bombgd::invade::starsky::invade::starsky::invade::starsky::bombgd:
:bombgd::bombgd::bombgd::starsky::invade::bombgd::bombgd::bombgd:
⠀⠀⠀⠀:bombgd::invade::starsky::bombgd:
⠀⠀⠀⠀:bombgd::bombgd::bombgd::bombgd:
1n2u 9 月 16 日 下午 11:37 
:ai_flare::ai_flare::ai_flare:中秋快乐:Speech_Love::griin:
菊子班 9 月 16 日 上午 10:33 
中秋快乐
小^春子^ᶫᵒᵛᵉᵧₒᵤ 9 月 15 日 下午 11:44 
~中秋快乐~
:datealivetohka::datealiveorigami::datealiveyoshino::datealivekurumi::datealivekotori::datealivekaguya::datealiveyuzuru::datealivemiku::hananono_ouka::hananono_shione::hananono_ryouko::hananono_shizuku::cinnamon2::shigure2:
⣿⣿⣿⣿⣿⣿⣿⡸⣿⣷⣶⣍⡻⣿⣧⢹⣿⣿⡆⣿⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣷⣌⠻⣿⣿⣿⣦⡙⠜⣿⣿⣿⢸⣿⣿⣿⣿
⣿⣿⣿⣿⣿⣿⣿⣿⣿⣷⣮⡛⢿⣿⣿⣦⣹⣿⣿⣌⣛⠿⣿⣿
⣿⣿⣿⣿⣿⣿⠿⢛⣛⣛⣛⣛⠶⡍⢻⣿⣿⣿⣿⣿⣿⢷⣌⢿
⣿⢫⣭⡛⢟⣵⣾⣿⣿⣿⣿⣿⣿⣦⣿⣿⣿⣿⣿⣿⣇⣀⣿⡎
⣷⢸⣿⣿⣾⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⡇
⣿⣧⠻⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⠟⣼
⣿⣿⣷⠌⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⣛⠛⣛⣋⣵⣾⣿
⡟⣩⣶⣿⣿⣿⣿⣿⣿⣿⣿⣿⣿⢿⣿⣿⣿⣿⣷⣮⢹⣿⣿⣿
⣇⠻⣿⣿⠿⣛⣭⣝⣛⣛⣛⣩⣵⣶⣮⣝⡻⠿⠿⠿⣸⣿⣿⣿
apoper114dolce 9 月 14 日 上午 6:04 
⠀⠀ :fireflies::dealstars::fireflies:⠀⠀⠀⠀⠀⠀:fireflies::dealstars::fireflies:
:fireflies::dealstars::Y_H::Y_H::dealstars:⠀⠀::dealstars::Y_H::Y_H::dealstars::fireflies:
:dealstars::Y_H::glare::glare::Y_H::fireflies::Y_H::glare::glare::Y_H::dealstars:
:fireflies::Y_H::glare::glare::glare::Y_H::glare::glare::glare::Y_H::fireflies:
⠀⠀ :dealstars::Y_H::glare::glare::glare::glare::glare::Y_H::dealstars:
⠀⠀⠀⠀ :fireflies::Y_H::glare::glare::glare::Y_H::fireflies:
⠀⠀⠀⠀⠀⠀ :dealstars::Y_H::glare::Y_H::dealstars:
⠀⠀⠀⠀⠀⠀⠀⠀ :fireflies::Y_H::fireflies:
⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀ :dealstars: