1(1/100)+2(1/100)+3(1/100)+...+99(1/100)简算
问题描述：
1(1/100)+2(1/100)+3(1/100)+...+99(1/100)简算
答
1(1/100)+2(1/100)+3(1/100)+...+99(1/100)
=(1/100)*(1+2+3+.+99)
=(1/100)*(1+99)*99/2
=(1/100)*100*99/2
=99/2