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Mn giups em với
3 tháng 9 2021
a) \(x^3-9x=0\)
\(\Leftrightarrow x\left(x^2-9\right)=0\Leftrightarrow x\left(x-3\right)\left(x+3\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=3\\x=-3\end{matrix}\right.\)
b) \(\left(3x+1\right)^2-16=0\)
\(\Leftrightarrow\left(3x+1-4\right)\left(3x+1+4\right)=0\)
\(\Leftrightarrow3\left(x-1\right)\left(3x+5\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=1\\x=-\dfrac{5}{3}\end{matrix}\right.\)
3 tháng 9 2021
a: Ta có: \(x^3-9x=0\)
\(\Leftrightarrow x\left(x-3\right)\left(x+3\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=3\\x=-3\end{matrix}\right.\)
b: Ta có: \(\left(3x+1\right)^2-16=0\)
\(\Leftrightarrow\left(3x-2\right)\left(3x+4\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{2}{3}\\x=-\dfrac{4}{3}\end{matrix}\right.\)
giups em voi a
9 tháng 11 2021
Bài 2:
b: \(\Leftrightarrow x^2=10\)
hay \(x=\pm\sqrt{10}\)
NN
21 tháng 7 2021
1. how far is it from here to the nearest post office?
2 how far is it from new york to california?
3. how far is it from your house to your family store
4 how far is it from beijing to berlin
5 how far is it from your hotel to the beach
DT
Đỗ Thanh Hải
CTVVIP
21 tháng 7 2021
1 How far is it from here to the nearest post office?
2 How far is it from New Yorn to California?
3 How far is it from your house to the your family store?
4 How far is it from Beijing to Berlin?
5 How far is it from your hotel to the beach?
1. easier
2.the most interesting
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11. the most famous
1. easier
2. the most interesting
3. the hottest
4. the most difficult
5. better
6. more interesting
7. the most intelligent
8. the oldest
9. more important
10. more expensive
11. the most famous