1+2+3+4+5+6+7+8+9+1+11+12+13+14+15````````
问题描述:
1+2+3+4+5+6+7+8+9+1+11+12+13+14+15````````
1+2+3+4+5+6+7+8+9+1+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28++29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50························································································+99999999999+100000000000=?
汉语拼音拼成一段话:woshidashabi,woshidashabi,woshadehenlipu,danshiwohensha.wosha,wosha,wojiushihensha,wochun,wochun,woyeshihenchun,danshiwohenkaixin,ouye!求汉语!
答
首项加末项,乘以项数,除以二.答案:5000000000050000000000.汉语拼音那段,抱歉,太侮辱人了