第1个回答 2011-10-09
1/10+1/100+1/1000+......+1/100000000
答案:=0.1+0.01+0.001+。。。。。。+0.000000(七个0)1
=0.1111111。。。1(八个一)
1/1+2+1/1+2+3+1/1+2+3+4+......+1/1+2+3+4+5+6+...+100
答案:=1/3+1/6+1/10+.....+1/5050
=1/2*(1/2*3+1/3*4+1/4*5+。。。。。。+1/100*101)
=1/2*(1/2-1/101)
=99/404
1/2*5+1/5*8+1/8*11+1/11*14
答案=1/3*(1/2-1/14)
=1/7
1/2+1/4+1/8+1/16+1/32+......+1/1024
=512+256+128+64+32+16+8+4+2+1/1024
=1023/1024
1/13+2/13+3/13+4/13+5/13+......+12/13
=1+2+3+4+...+12/13
=6
1/152+1/304+1/608+1/1216+1/2432
=(3/304+1/608)+1/1216+1/2432
=(7/608+1/1216)+1/2432
=31/2432本回答被提问者采纳