CÂU 37 --> CÂU 40
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Những câu hỏi liên quan
17 tháng 1 2022
Câu 36: A
Câu 37: D
Câu 38: C
Câu 39: C
Câu 40: B
Câu 41: D
13 tháng 6 2021
37. They used to go to school by bike when they were young
38. Quang suggested that they sould visit the Royal Citadel first
39. The car was too expensive for my dad to buy
40. My teacher told me to follow his instruction if I wanted to pass that module
DT
Đỗ Thanh Hải
CTVVIP
13 tháng 6 2021
38 Quang suggested that the Royal Citadel should be visited first
39 The car was too expensice for my dad to buy
40 My teacher told me to follow his instructions if I wanted to pass this module
DT
Đỗ Thanh Hải
CTVVIP
23 tháng 6 2021
37 He suggested that Sue buy that picture as an anniversary present for Jack
38 You know the man who sat next to me at the meeting last night, don't you?
39 Covid 19 prevented us from travelling to Da Lat
40 If I had much money, I could buy that house immediately
17 tháng 9 2017
1.\(\frac{4}{3.7}+\frac{4}{7.11}+\frac{4}{11.15}+\frac{4}{15.19}+\frac{4}{19.23}+\frac{4}{23.27}\)
\(=\frac{1}{3}-\frac{1}{7}+\frac{1}{7}-\frac{1}{11}+...+\frac{4}{23}-\frac{4}{27}\)
\(=\frac{1}{3}-\frac{1}{27}=\frac{9}{27}-\frac{1}{27}=\frac{8}{27}\)
2. Đặt \(A=\frac{3}{14}+\frac{3}{84}+\frac{3}{204}+\frac{3}{374}+\frac{3}{594}+\frac{3}{864}\)
\(\Rightarrow A=\frac{3}{2.7}+\frac{3}{7.12}+...+\frac{3}{27.32}\)
\(\Rightarrow5A=3.\left(\frac{5}{2.7}+\frac{5}{7.12}+...+\frac{5}{27.32}\right)\)
\(\Rightarrow5A=3.\left(\frac{1}{2}-\frac{1}{7}+\frac{1}{7}-\frac{1}{12}+...+\frac{1}{27}-\frac{1}{32}\right)\)
\(\Rightarrow5A=3.\left(\frac{1}{2}-\frac{1}{32}\right)\)
\(\Rightarrow5A=3.\frac{15}{32}=\frac{45}{32}\Rightarrow A=\frac{45}{32}:5=\frac{9}{32}\)
3. Đặt \(S=\frac{1}{10}+\frac{1}{40}+\frac{1}{88}+...+\frac{1}{340}\)
\(\Rightarrow3S=\frac{3}{10}+\frac{3}{40}+...+\frac{3}{340}\)
\(\Rightarrow3S=\frac{3}{2.5}+\frac{3}{5.8}+...+\frac{3}{17.20}\)
\(\Rightarrow3S=\frac{1}{2}-\frac{1}{5}+\frac{1}{5}-\frac{1}{8}+...+\frac{1}{17}-\frac{1}{20}\)
\(\Rightarrow3S=\frac{1}{2}-\frac{1}{20}=\frac{9}{20}\Rightarrow S=\frac{9}{20}:3=\frac{3}{20}\)
SO
17 tháng 9 2017
Câu 1:
\(\frac{4}{3.7}+\frac{4}{7.11}+\frac{4}{11.15}+\frac{4}{15.19}+\frac{4}{19.23}+\frac{4}{23.27}\)
\(\Rightarrow\frac{1}{3}-\frac{1}{7}+\frac{1}{7}-\frac{1}{11}+\frac{1}{11}-\frac{1}{15}+\frac{1}{15}-\frac{1}{19}+\frac{1}{19}-\frac{1}{23}+\frac{1}{23}-\frac{1}{27}\)
\(\Rightarrow\frac{1}{3}-\frac{1}{27}\)
\(=\frac{8}{27}\)
HT
18 tháng 1 2016
\(A=\frac{1}{2012}+\frac{37^{2012}}{2012^{38}}+\frac{1}{2012^{38}}\)
\(B=\frac{1}{2012}+\frac{37^{2012}}{2012^{39}}+\frac{2}{2012^{39}}\)
Ta có:
\(A-B=\frac{37^{2012}}{2012^{38}}-\frac{37^{2012}}{2012^{39}}+\frac{1}{2012^{38}}-\frac{2}{2012^{39}}\)
\(A-B=\frac{37^{2012}}{2012^{38}}\left(1-\frac{1}{2012}\right)+\frac{1}{2012^{38}}\left(1-\frac{2}{2012}\right)\)
\(A-B=\frac{37^{2012}}{2012^{38}}\left(\frac{2011}{2012}\right)+\frac{1}{2012^{38}}\left(\frac{2010}{2012}\right)\)
A - B > 0
=> A > B
18 tháng 1 2016
A=201237/201238+ 372012/201238+1/201238
= 1/2012+ 372012/201238+ 1/201238
Tương tự ta có:
B=1/2012+ 372012/201239+1/201239+1/201239
Ta thấy: 1/2012=1/2012( ở 2 vế)
372012/201238 > 372012/ 201239( do cùng tử, mẫu nào nhỏ hơn thì phân số đó lớn hơn)
tương tự: 1/201238> 1/201239( 201238< 201239)
201239 là một số rất lớn nên 1/201239 rất bé và gần đến 0.
Vậy A>B.
8 tháng 6 2021
Tiền vốn của sách đó là :
45000 x 20% = 9000(đồng)
Đ/s: 9000 đồng
40 Ba suggested that face mask should be worn when going out in public.
37. If he weren't lazy, he wouldn't get bad marks.
38. The boys felt interested in the show.
39. My brother had the vet examined his pet dog last week.
40. Ba suggested that face mask should be worn when going out in public.