What is in the kitchen?

\(\dfrac{-9}{x}=\dfrac{-3}{\dfrac{4}{49}}\)

<=> \(\dfrac{-9}{x}=\dfrac{-147}{4}\)

<=> \(-9\cdot4=-147\cdot x\)

<=> \(-36=-147\cdot x\)

\(x=\dfrac{-36}{-147}=\dfrac{36}{147}\)

1) Where do we live?

2) Where is the museum?

3) Is there a hospital in my neighbourhood?

4) Is there a drugstore next to my house?

5) Where does Lan's mother work?

6) Where does Ba's father work?

7) Where do they live?

8) Where is Minh's house?

1: to repair

2: learning

3: playing

4: inviting

\(\left|7x+1\right|=20\)

<=> \(7x+1=\pm20\)

TH1: 7x + 1 = 20

=> \(x=\left(20-1\right):7=\dfrac{19}{7}\) (loại vì x thuộc Z)

TH2: 7x + 1 = -20

=> \(x=\left(-20-1\right):7=-3\) (chọn)

Vậy x = -3 thỏa mãn đề bài.

Đáp án là B: should.