1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30.+10000等于
问题描述:
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30.+10000等于
答
(1+10000)x10000/2=50005000
答
=10001×10000÷2
=50005000
答
(1+10000)*10000/2=50005000