(1):1/1*2+1/2*3+1/3*4+1/4*5+.1/99*100=?
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(1):1/1*2+1/2*3+1/3*4+1/4*5+.1/99*100=?
(2):3/2-5/6+7/12-9/20+11/30-13/42+15/56?
注:以上皆表示分数(符号除外),如:"1/2"表示二分之一,"1/2*3"表示六分之一.
用简便运算解题,越简便越好!现在手头紧,有好的回答加分,
(2):3/2-5/6+7/12-9/20+11/30-13/42+15/56?
注:以上皆表示分数(符号除外),如:"1/2"表示二分之一,"1/2*3"表示六分之一.
用简便运算解题,越简便越好!现在手头紧,有好的回答加分,
1、1/1*2+1/2*3+1/3*4+1/4*5+.1/99*100
=1/1-1/2+1/2-1/3+1/3-1/4+.+1/99-1/100
=1-1/100
=99/100
2、原式=(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1+1/8
=9/8
再问: OK,那你确定对吗?
再答: 一定对的!
=1/1-1/2+1/2-1/3+1/3-1/4+.+1/99-1/100
=1-1/100
=99/100
2、原式=(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)
=1+1/8
=9/8
再问: OK,那你确定对吗?
再答: 一定对的!
(1):1/1*2+1/2*3+1/3*4+1/4*5+.1/99*100=?
1/1×2+1/2×3+1/3×4+1/4×5+.+1/98×99+1/99×100=?
1/1*2+1/2*3+1/3*4+1/4*5+.1/98*99+1/99*100=?
1*2/1+2*3/1+3*4/1+.98*99/1+99*100/1=?
|1/3-1/2|+|1/4-1/3|+|1/5+1/4|+...+|1/100-1/99|=?有谁能解急
1/1*2*3*4+1/2*3*4*5+...+1/97*98*99*100=?
(1/3+2/3)+(1/4+2/4+3/4)+(1/5+2/5+3/5+4/5)+.+(1/100+.99/100)=
1/(1*2)+1/(2*3)+1*(3*4)+1/(4*5)……1/(98*99)+1/(99+100)=?
1-1/2+1/3-1/4+1/5-1/6…+1/99-1/100)/(1/51+1/52+1/53+…+1/99+1/
(1+1/1*3)*(1+1/2*4)*(1+1/3*5).(1+1/98*100)*(1+1/99*101)
(1+1/1+3)*(1+1/2*4)*(1+1/3*5)*.*(1+1/98*100)*(1+1/99*101)
1/1*2*3+1/2*3*4+1/3*4*5+...+1/99*100*101