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1 tháng 11 2021
b: \(BC\cdot\sin B\cdot\sin C\)
\(=BC\cdot\dfrac{AC}{BC}\cdot\dfrac{AB}{BC}\)
\(=\dfrac{BC\cdot AH\cdot BC}{BC^2}=AH\)
TA
8 tháng 12 2021
1. How will they travel to HN?
2. Where is the high school?
3. Who would you like to take the trip with?
4. Does she like visiting famous historical places?
5. How long has your brother learnt to play the guitar?
6. Why do you often listen to English songs?
7. How far is it from Hue to HCM City?
8 tháng 12 2021
1. How will they travel to Ha Noi?
2. Where is the high school?
3. Who would you like to take the trip with?
4. Does she like visiting famous historical places?
5. How long has your brother learnt to play the guitar?
6. Why do you often listen to English songs?
7. How far is it from Hue to HCM City?
DH
1
AH
Akai Haruma
Giáo viên
14 tháng 7 2023
Bài 2:
1.
$=(\frac{1}{7}+\frac{2}{7}+\frac{4}{7})+(\frac{3}{11}+\frac{8}{11})+2010$
$=\frac{7}{7}+\frac{11}{11}+2010=1+1+2010=2012$
2.
$=(\frac{2}{3}-\frac{2}{3})+(\frac{-3}{4}+\frac{3}{4})+(\frac{4}{5}-\frac{4}{5})+(\frac{-5}{6}+\frac{5}{6})+(\frac{6}{7}-\frac{6}{7})+(\frac{-7}{8}+\frac{7}{8})+\frac{1}{2012}$
$=0+0+0+0+0+0+\frac{1}{2012}=\frac{1}{2012}$
3.
$=\frac{1}{5-4}{4.5}+\frac{6-5}{5.6}+\frac{7-6}{6.7}+...+\frac{1}{20-19}{19.20}$
$=\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+..+\frac{1}{19}-\frac{1}{20}$
$=\frac{1}{4}-\frac{1}{20}=\frac{1}{5}$
4.
\(=182\left[\frac{1+\frac{1}{5}-\frac{2}{7}+\frac{5}{13}}{2(1+\frac{1}{5}-\frac{2}{7}+\frac{5}{13})}: \frac{4(1-\frac{1}{33}-\frac{1}{57}+\frac{1}{7000})}{1-\frac{1}{33}-\frac{1}{57}+\frac{1}{7000}}\right]:\frac{10101\times 91}{10101\times 80}\)
$=182(\frac{1}{2}:4):\frac{91}{80}=182\times \frac{1}{8}\times \frac{80}{91}$
$=\frac{91\times 2\times 80}{8\times 91}=\frac{160}{8}=20$
HV
7 tháng 12 2021
1 Hoi An Ancient Town is visited by thousands of tourists every weekend
2 A lot of beautiful crafts are sold by the souvenir shops next to the ticket office
3 When was the first modern university established in VN?
4 French and English are spoken in Canada
5 Is cotton exported to many countries by Egypt?
6 Children are given presents by Santa Claus on Christmas Eve
7 Her dogs are fed twice a day by her
LD
15 tháng 12 2021
1 Hoi An Ancient Town is visited by thousands of tourists every weekend
2 A lot of beautiful crafts are sold by the souvenir shops next to the ticket office
3 When was the first modern university established in VN?
4 French and English are spoken in Canada
5 Is cotton exported to many countries by Egypt?
6 Children are given presents by Santa Claus on Christmas Eve
7 Her dogs are fed twice a day by her
C
17 tháng 12 2023
12,12 x 7,5 + 12,12 : 2 + 12,12 + 12,12
= 12,12 x 7,5 + 12,12 x 0,5 + 12,12 x 1 + 12,12 x 1
= 12,12 x (7,5 + 0,5 + 1 + 1)
= 12,12 x 10
= 121,2
DT
Đỗ Thanh Hải
CTVVIP
27 tháng 11 2021
1 many => much
2 some => any
3 too => either
4 at=> in
5 were=> was
6 making => to make
7 to => from
8 question => questions
9 although => because