b=1/4+1/5+1/6…+1/19.Hay chung to rang B>1 23/10/2021 Bởi Ariana b=1/4+1/5+1/6…+1/19.Hay chung to rang B>1
b=1/4+1/5+1/6…+1/19 b=1/4+(1/5+1/6+…+1/9)+(1/10+1/11+…+1/19) Vì 1/5+1/6+…+1/9>1/9+1/9+…+1/9=5/9>1/2 Vì 1/10+1/11+…+1/19>1/19+1/19+…+1/19 =>b>1/4+5/9+10/19>1/4+1/2+1/2>1 =>b>1 Chúc hok tốt!! Bình luận
Đáp án: B=1/4−1/5+1/6+….+1/19 =1/4+(1/5+1/6+….+1/9)+(1/10+1/11+….+1/19) Vì 1/5+1/6+….+1/9>1/9+1/9+1/9+…+1/9 =5/9>1 Chúc bạn làm bài tốt và cho mình ctlhn nhé Bình luận
b=1/4+1/5+1/6…+1/19
b=1/4+(1/5+1/6+…+1/9)+(1/10+1/11+…+1/19)
Vì 1/5+1/6+…+1/9>1/9+1/9+…+1/9=5/9>1/2
Vì 1/10+1/11+…+1/19>1/19+1/19+…+1/19
=>b>1/4+5/9+10/19>1/4+1/2+1/2>1
=>b>1
Chúc hok tốt!!
Đáp án:
B=1/4−1/5+1/6+….+1/19
=1/4+(1/5+1/6+….+1/9)+(1/10+1/11+….+1/19)
Vì 1/5+1/6+….+1/9>1/9+1/9+1/9+…+1/9
=5/9>1
Chúc bạn làm bài tốt và cho mình ctlhn nhé