CMR 1/26+1/27+1/28+…+1/50=1-1/2+1/3-1/4+…+1/49-1/50 04/07/2021 Bởi Audrey CMR 1/26+1/27+1/28+…+1/50=1-1/2+1/3-1/4+…+1/49-1/50
Đáp án: Giải thích các bước giải: 1/26+1/27+1/28+….+1/50=1-1/2+1/3-1/4+……+1/49-1/50=1-1/2+1/3-1/4+…+1/49-1/50 =(1+1/3+1/5+…+1/49)-(1/2+1/4+…+1/50) =(1+1/2+1/3+….+1/50)-2.(1/2+1/4+…+1/50) =(1+1/2+1/3+…+1/50)-(1+1/2+1/3+…+1/25) =1/26+1/27+…..+1/50 =0,020… Bình luận
1/26+1/27+1/28+….+1/50=1-1/2+1/3-1/4+……+1/49-1/50 =1-1/2+1/3-1/4+…+1/49-1/50=(1+1/3+1/5+…+1/49)-(1/2+1/4+…+1/50) =(1+1/2+1/3+….+1/50)-2.(1/2+1/4+…+1/50) =(1+1/2+1/3+…+1/50)-(1+1/2+1/3+…+1/25) =1/26+1/27+…..+1/50 ⇒ ĐPCM Bình luận
Đáp án:
Giải thích các bước giải:
1/26+1/27+1/28+….+1/50=1-1/2+1/3-1/4+……+1/49-1/50=1-1/2+1/3-1/4+…+1/49-1/50
=(1+1/3+1/5+…+1/49)-(1/2+1/4+…+1/50)
=(1+1/2+1/3+….+1/50)-2.(1/2+1/4+…+1/50)
=(1+1/2+1/3+…+1/50)-(1+1/2+1/3+…+1/25)
=1/26+1/27+…..+1/50
=0,020…
1/26+1/27+1/28+….+1/50=1-1/2+1/3-1/4+……+1/49-1/50
=1-1/2+1/3-1/4+…+1/49-1/50=(1+1/3+1/5+…+1/49)-(1/2+1/4+…+1/50)
=(1+1/2+1/3+….+1/50)-2.(1/2+1/4+…+1/50)
=(1+1/2+1/3+…+1/50)-(1+1/2+1/3+…+1/25)
=1/26+1/27+…..+1/50
⇒ ĐPCM