高考问答医用一次性橡胶手套:〔1/3)*(1/3)+(2/30)*(2/30)+(3/300)*(3/300)+(4/3000)*(4/3000)
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通分啊
(1000/3000)*(1000/3000)+(200/3000)*(200/3000)+(30/3000)*(30/3000)+(4/3000)*(4/3000)
=(1000000+40000+900+16)/9000000
=1040916/9000000
=212/1833
=0.1157
(1000/3000)*(1000/3000)+(200/3000)*(200/3000)+(30/3000)*(30/3000)+(4/3000)*(4/3000)=(1000000+40000+900+16)/9000000=1040916/9000000
0.1157
计算器呀,,,,
〔1/3)*(1/3)+(2/30)*(2/30)+(3/300)*(3/300)+(4/3000)*(4/3000)
1/3=?？？？？？
(1/2005-1)(1/2004-1)........(1/3-1)(1/2-1)
1+1/(1+2)+1/(1+2+3)+...+1/(1+2+3+...+100)
1+1/1+2+1/1+2+3+......+1/1+2+3+......+10
1/1+1/2+1/3+1/4+。。。。+1/N 是多少
1/1*2+1/2*3+1/3*4+...+1/2000*2001
1/(1*2)+1/(2*3)+1/(3*4)+..+1/(99*100)
1/3 *3=1?
1/2,1/3,2/3,6/3,( ),18/3