5/11+5/12+5/13+5/14
5/11+5/12+5/13+5/14
5/11+5/12+5/13+5/14
=115/132+5/13+5/14
=2155/1716+5/14
=1.612970363
5/11+5/12=5/13+5/14
CMR: 5/11+5/12+5/13+5/14<2
Ta có : \(\frac{5}{11}+\frac{5}{12}+\frac{5}{13}+\frac{5}{14}\)
\(=5.\left(\frac{1}{11}+\frac{1}{12}+\frac{1}{13}+\frac{1}{14}\right)\)
\(< 5.\left(\frac{1}{11}+\frac{1}{11}+\frac{1}{11}+\frac{1}{11}\right)\)
\(=5.\frac{4}{11}\)
\(=\frac{20}{11}< \frac{20}{10}=2\)
Vậy \(\frac{5}{11}+\frac{5}{12}+\frac{5}{13}+\frac{5}{14}\left(đpcm\right)\)
bạn vào câu hỏi tương tự ấy
nãy có một bạn mới dăng lên và mk đã giải trong đó rồi
1/2+2/3+3/4+4/5+5/6+6/7+7/8+8/9+9/10+10/11+11/12+12/13+13/14+14/15=?
Tính
a, -6/11: ( 3/5 . 4/11)
b, 7/12+5/12:6-14/30
c, ( 4/5 + 1/2 ): ( 3/13-8/13)
d, ( 2/3 -1/4 +5/11):(5/12+1-7/11)
a)\(\dfrac{-6}{11}:\left(\dfrac{3}{5}.\dfrac{4}{11}\right)=\dfrac{-5}{2}\)
b)\(\dfrac{7}{12}+\dfrac{5}{12}:6-\dfrac{14}{30}=\dfrac{67}{370}\)
c)\(\left(\dfrac{4}{5}+\dfrac{1}{2}\right):\left(\dfrac{3}{13}-\dfrac{8}{13}\right)=-\dfrac{169}{50}\)
d)\(\left(\dfrac{2}{3}-\dfrac{1}{4}+\dfrac{5}{11}\right):\left(\dfrac{5}{12}+1-\dfrac{7}{11}\right)=\dfrac{115}{103}\)
Thực hiện phép tính
(5^12+5^13+5^14):(5^10+5^11+5^12)
bằng 25
tui là người đầu tiên nhớ cho nhiều h nhé
(-2/11+ 3/12 +-4/13 +5/14) : (-4/11 + 6/12+ -8/13 +10/14)
(-2/11+ 3/12 +-4/13 +5/14) : (-4/11 + 6/12+ -8/13 +10/14)0000000000000000000000000000000000000= 0
Cho A=5/11+5/12+5/13+5/14. Chứng tỏ 1<A<2
5/11+5/12+5/13+5/14 > 5/20+5/20+5/20+5/20
5/11+5/12+5/13+5/14 > 1
5/11+5/12+5/13+5/14 < 5/10+5/10+5/10+5/10
5/11+5/12+5/13+5/14 < 2
Nha bạn Tạ Lương Minh Hoàng
>,<,=
a,2/3+3/4+4/5+7/9+9/11...................5
b,1/10+1/11+1/12+1/13+1/14...............1/5
c,15/5+13/11+22/21..................5