einecs用途:1/2+5/6+11/12+...+109/110等于多少?
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最好用分数来做.
1/2+5/6+11/12+...+109/110=101-(1/2+1/6+1/12…+1/110)
=10-(1-1/2+1/2-1/3+1/3-1/4+…1/10-1/11)
=10+(1-1/11)
=10+10/11
=120/11
原式=(1-1/2)+(1-1/6)+(1-1/12)……+(1-1/110)
=1×10-(1/1×2+ 1/2×3+ 1/3×4……+1/10× 11)
=10-(1-1/2+1/2-1/3+1/3-1/4……-1/10+1/10-1/11)
=10-(1-1/11)
=100/11
怎么样?????????
木牛流马1错啦啊~
原式=1*10-(1-1/2)+(1-1/6)......+(1-1/110)
=10-10/11
=100/11
宇文雪见好像格式不对呦。
注:1/2=1/1*2=1-1/2同理1/6=1/2*3=1/2-1/3
1/2+5/6+11/12+...+109/110等于多少?
1/2+5/6+11/12+ 109/110=?
2,2,3,6,( ),45 // 1/2,1,1,( ),9/11,11/13 //
大家帮忙看看谁会作这道题呀!2*3/5+5*2/7+7*4/11+11*5/16+16*6/22+22*7/29+1/29
大家帮忙看看谁会作这道题呀!2*3/5+5*2/7+7*4/11+11*5/16+16*6/22+22*7/29+1/29
计算:1/2+5/6+11/12+19/20+……+89/90+109/110=
1/2+5/6+11/12+19/20+29/30……9899/990=?
1/(2/3)/(3/4)/(4/5)/(5/6)/(6/7)/(7/8)
1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/9+1/10+1/11+1/12+1/13……(一直按规律加到)1/2000
-2/5 1/5 -8/750 11/375 规律