1/ a/ So sánh 2^225 và 3^156
b/Tìm x biết : (2x.1)^2=16
MN giúp e mai ktra r ạ :<
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violet
Giáo viên
27 tháng 2 2021
Chào em, em tham khảo nhé!
1: The paparazzi had followed Princess Diana.
=> Princess Diana had been followed by the paparazzi.
2: Celebrities often accuse the paparazzi of putting lives in danger.
=> The paparazzi is often accused by celebrities of putting lives in danger.
3: The police arrested the photographer.
=>The photographer was arrested by the police.
4: The paparazzi have followed him everywhere.
=> He has been followed by the paparazzi everywhere.
5: Michael Douglas did not give the guests the location of the wedding.
=>The guests were not given the location of the wedding by Michael Douglas.
6: The paparazzi do not pay celebrities.
=> Celebrities are not paid by the paparazzi.
Chúc em học tốt và có những trải nghiệm tuyệt vời tại hoc24.vn!
27 tháng 2 2021
III> Rewrite using the correct passive form.
1: The paparazzi had followed Princess Diana. => Princess Diana had been followed by the paparazzi
2: Celebrities often accuse the paparazzi of putting lives in danger.
=> The paparazzi are often accused of putting lives in danger.
3: The police arrested the photographer.
=>The photographer was arrested by the police.
4: The paparazzi have followed him everywhere.
=> He has been followed everywhere by the paparazzi.
5: Michael Douglas did not give the guests the location of the wedding.
=>The guests weren't given the location of the wedding by Michael Douglas.
6: The paparazzi do not pay celebrities.
=> Celebrities aren't paid by the paparazzi.
3 tháng 7 2017
tách ra nha :
\(\left(a^2-1\right)\left(a^2-40\right)< 0\)
\(\Rightarrow\left(a-1\right)\left(a+1\right)\left(a-20\right)\left(a+20\right)< 0\)
Xét từng nhân tử phải nhỏ hơn 0 thì đa thức nhỏ hơn không
xét ta có kết quả
3 tháng 7 2017
o0o I am a studious person o0o
Sai nhá (a2 - 40) ko thể = (a - 20) (a + 20)
Vù 40 khác 202
Câu a) đề bài có sai không bạn?
b) \(\left(2x.1\right)^2=16\)
\(\Rightarrow\left(2x.1\right)^2=\left(\pm4\right)^2\)
\(\Rightarrow2x.1=\pm4.\)
\(\Rightarrow\left[{}\begin{matrix}2x.1=4\\2x.1=-4\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}2x=4\\2x=-4\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=4:2\\x=\left(-4\right):2\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=2\\x=-2\end{matrix}\right.\)
Vậy \(x\in\left\{2;-2\right\}.\)
Chúc bạn học tốt!
Đề câu b sai thì phải?