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3 tháng 3 2020
\(\left(3-x\right)\left(x+7\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}3-x=0\\x+7=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=3\\x=-7\end{cases}}}\)
Vậy x=3; x=-7
26 tháng 2 2020
n - 6 chia hết cho n - 1
=> n - 1 - 5 chia hết cho n - 1
=> 5 chia hết cho n - 1
=> n - 1 thuộc Ư(5)
=> n - 1 thuộc {-1;1-5;5}
=> n thuộc {0;2;-4;6}
NN
0
TN
2
4 tháng 5 2018
\(\left(x+2\right)\left(x+3\right)\left(x+4\right)\left(x+5\right)=24\)
\(\Leftrightarrow\left(x+1\right)\left(x+6\right)\left(x^2+7x+16\right)=0\)
22 tháng 7 2017
1x5+4x-78=100
5+4x-78=100
5+4x=178
4x=173
x=173/4
Vậy x=173/4
1. Not only my aunt but also my cousins live with me.
2. They ask about the athletes whose pictures we are looking at.
3. It is a new hospital that was built near the airport by Mary.
4. These students are believed to win the first prize.
5. Mike invited Linda to have dinner with them that night.
6. Neither the radio nor the television works properly.
7. If he had gone to bed early last night, he wouldn't be tired this morning.
8. She wishes she would study in Paris.
9. Three men are said to have been arrested after the explosion.
10. That computer doesn't work as effectively as this one.
11. Tom begged John to turn off the TV.