help! about maths

来源：学生作业帮编辑：搜搜做题作业网作业帮分类：数学作业时间：2024/07/27 01:40:50

help! about maths
51+52+53+.+100=（答案和计算过程）
21+22+23+.+50=?

『(1+100)×100÷2』-『(1+50)×50÷2』(答案自己算)
第2道题也是跟第1道一样 ·····

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