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1: \(x=\dfrac{3}{4}-\dfrac{2}{4}=\dfrac{1}{4}\)
2: \(x=\dfrac{2}{11}+\dfrac{1}{5}=\dfrac{10+11}{55}=\dfrac{21}{55}\)
1.the souvenirs inside the temple of literature are sold at a higher price
2. can you help me to make a glass of lemonade, please?
3.Linh finds playing chess interesting because he can play it with his close friend.
4.i think people in the countryside eat a lot of fresh vegetable so they live longer
5.volunteer work is very hard for my sister but she she really enjoys doing it
3. are there any eggs?-No, there aren't some
4.is there any salt?- yes, there is any
5.are there any carrots?-yes, there are some
6.are there any apples?-no there aren't some
7.is there any suger?-yes, there is any
8.are there any cakes?-no there aren't some
9.is there any butter?-no. there isn't any
10. is there any mineral water?- yes. there is any
\(B=\frac{x+4}{x^2+x}\)nguyên mà \(x\)nguyên suy ra \(\frac{\left(x+4\right)x}{x^2+x}\)nguyên.
Ta có: \(\frac{\left(x+4\right)x}{x^2+x}=\frac{x^2+4x}{x^2+x}=\frac{x^2+x+3x}{x^2+x}=1+\frac{3}{x+1}\)nguyên tương đương với \(\frac{3}{x+1}\)nguyên
mà \(x\)nguyên nên \(x+1\inƯ\left(3\right)=\left\{-3,-1,1,3\right\}\Leftrightarrow x\in\left\{-4,-2,0,2\right\}\).
Thử lại có \(x\in\left\{-4,-2,2\right\}\)thỏa mãn.