(1+3+5+7...+99)+(2+4+6+8...+100)
问题描述:
(1+3+5+7...+99)+(2+4+6+8...+100)
答
(1+3+5+7...+99)+(2+4+6+8...+100)
=1+2+3+4+5...+99+100
=(1+100)+(2+99)+……+(50+51)
=101*50
=5050
答
(1+100)x50=5050
答
=(1+2+3……+99=100)
=(1+100)×100÷2
=101×50
=5050