1-1/2+1/3-1/4+1/5-1/6+…+1/99-1/100 1/(101+1)+1/(2+102)+1/(3+103)+…+1/(49+149)+1/(50+150)第一行是分子,第二行是分母
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/30 00:42:56
xQA
0UM/ )DG=
Uz$mQAvf:;Q]d9T]j.zϣ伅B6НCcb ]OJnz$_4/;
:%5p~B,
B_İAc(Bw-hmW(=CW>ʥV*b"SM
41D+c6Tc=lF| |6P=1
1-1/2+1/3-1/4+1/5-1/6+…+1/99-1/100 1/(101+1)+1/(2+102)+1/(3+103)+…+1/(49+149)+1/(50+150)第一行是分子,第二行是分母
1-1/2+1/3-1/4+1/5-1/6+…+1/99-1/100 1/(101+1)+1/(2+102)+1/(3+103)+…+1/(49+149)+1/(50+150)
第一行是分子,第二行是分母
1-1/2+1/3-1/4+1/5-1/6+…+1/99-1/100 1/(101+1)+1/(2+102)+1/(3+103)+…+1/(49+149)+1/(50+150)第一行是分子,第二行是分母
分子=1-1/2+1/3-1/4+1/5-1/6……+1/99-1/100
=1+1/2+1/3+1/4+1/5+1/6……+1/99+1/100-2*(1/2+1/4+1/6+.+1/100)
=1+1/2+1/3+1/4+1/5+1/6……+1/99+1/100-(1+1/2+1/3+.+1/50)
=1/51+1/52+1/53+.+1/100
分母=1/102+1/104+1/106+.+1/200
=1/2*(1/51+1/52+1/53+.+1/100)
分子除分母=1/(1/2)=2