giúp mik vs...
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giúp mik vs mn
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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 , the most difficult
2 , the most delightful
3 , the most careful
4 , the tallest
5 , the best
6 , the oldest
7 , the most intelligent
8 , the most beautiful
9 , the most interesting
10 , the biggest
1. The most difficult
2. the most delightful
3. the most careful
4. the tallest
5. the best
6. the oldest
7. the most intelligent
8. the most beautiful
9. the most interesting
10. the biggest
k mik nha