Giúp mik vs mn
K
Khách
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DT
0
TK
1
DT
Đỗ Thanh Hải
CTVVIP
6 tháng 9 2021
C
1 cooking
2 listening
3 reading
4 playing
5 cycling
1 People collect a lot of things such as stamps, milk bottle labels, comic books as well as car toys
2 She is 20 years old
3 She is a hairdresser
4 It is collecting candy shells
5 Her friends and relatives
B
1 F
2 F
3 F
4 F
5 T
NT
6 tháng 9 2021
c. \(\left|\dfrac{8}{4}-\left|x-\dfrac{1}{4}\right|\right|-\dfrac{1}{2}=\dfrac{3}{4}\)
\(\Rightarrow\left[{}\begin{matrix}\left|\dfrac{8}{4}-x+\dfrac{1}{4}\right|-\dfrac{1}{2}=\dfrac{3}{4}\\\left|\dfrac{8}{4}+x-\dfrac{1}{4}\right|-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}\left|\dfrac{9}{4}-x\right|-\dfrac{1}{2}=\dfrac{3}{4}\\\left|\dfrac{7}{4}+x\right|-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\)
\(\Rightarrow\left[{}\begin{matrix}\left[{}\begin{matrix}\dfrac{9}{4}-x-\dfrac{1}{2}=\dfrac{3}{4}\\x=\dfrac{9}{4}-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\\\left[{}\begin{matrix}\dfrac{7}{4}+x-\dfrac{1}{2}=\dfrac{3}{4}\\-\dfrac{7}{4}-x-\dfrac{1}{2}=\dfrac{3}{4}\end{matrix}\right.\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}\left[{}\begin{matrix}x=1\\x=\dfrac{7}{2}\end{matrix}\right.\\\left[{}\begin{matrix}x=-\dfrac{1}{2}\\x=-3\end{matrix}\right.\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=1\\x=\dfrac{7}{2}\\x=-3\end{matrix}\right.\)
Ở nơi x=9/4-1/2 là x-9/4-1/2 nha
KK
6 tháng 9 2021
a. -1,5 + 2x = 2,5
<=> 2x = 2,5 + 1,5
<=> 2x = 4
<=> x = 2
b. \(\dfrac{3}{2}\left(x+5\right)-\dfrac{1}{2}=\dfrac{4}{3}\)
<=> \(\dfrac{3}{2}x+\dfrac{15}{2}-\dfrac{1}{2}=\dfrac{4}{3}\)
<=> \(\dfrac{9x}{6}+\dfrac{45}{6}-\dfrac{3}{6}=\dfrac{8}{6}\)
<=> 9x + 45 - 3 = 8
<=> 9x = 8 + 3 - 45
<=> 9x = -34
<=> x = \(\dfrac{-34}{9}\)
NN
4
29 tháng 10 2021
Bài 5:
\(A=2A-A=2^2+2^3+...+2^{107}-2-2^2-...-2^{2016}=2^{107}-2\)
\(2\left(A+2\right)=2^{2x}\\ \Rightarrow2\left(2^{107}-2+2\right)=2^{2x}\\ \Rightarrow2^{108}=2^{2x}\\ \Rightarrow2x=108\\ \Rightarrow x=54\)
29 tháng 10 2021
Bài 3:
Gọi số học sinh lớp 7A, 7B lần lượt là a,b
Ta có: \(\left\{{}\begin{matrix}\dfrac{x}{8}=\dfrac{y}{9}\\y-x=5\end{matrix}\right.\)
Áp dụng TCDTSBN ta có:
\(\dfrac{x}{8}=\dfrac{y}{9}=\dfrac{y-x}{9-1}=\dfrac{5}{1}=5\)
\(\dfrac{x}{8}=5\Rightarrow x=40\\ \dfrac{y}{9}=5\Rightarrow y=45\)
Vậy số học sinh lớp 7A, 7B lần lượt là 40, 45 học sinh
1 is running - wants
2 is crying
3 became - has been
4 is raining - has been raining
5 will stay - come
6 have drunk
7 has she read
8 wrote
9 am decorating
10 bought - haven't sold - am having
11 were playing - heard - hid - took
12 was taking - saw
13 lost - has been
14 has been
15 have you had - had
16 hasn't gone - failed
17 haven't worn
18 were sleeping
19 was crossing - saw
20 left - haven't heard
21 were you doing
22 was watching - came
23 has done
24 was watering - began
25 has read
26 is he writing
27 haven't spoken
28 is knocking
29 am learning
30 haven't done
31 has taken
32 was listening
33 is sleeping
34 have read
35 won't get
36 is staying - has
37 was crossing - stepped - fell
38 was wearing
39 have - have been - was
40 will telephone
41 will see
42 will wait
43 will wake
44 haven't been
45 have already drunk - sat
46 fell - was getting
47 were you doing - was cleaning
48 has just gone
49 will cut
50 were you doing
51 are you going to paint
52 took - wasn't looking
53 broke - was doing
54 will you do - will be
55 is going
56 has lost
57 didn't go - rained
58 saw - was wearing
59 rains - won't go
60 will phone
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