\(3.\left(x-\dfrac{2}{3}\right)=0\)

\(\left(x-\dfrac{2}{3}\right)=0:3\)

\(x-\dfrac{2}{3}=0\)

\(x=0+\dfrac{2}{3}\)

\(x=\dfrac{2}{3}\)

(Người ta chỉ bảo số 0 ko là số chia chứ có bảo ko là số bị chia đâu nhỉ!)

\(x+3\dfrac{1}{2}+x=24\dfrac{1}{4}\)

\(\left(x+x\right)+3\dfrac{1}{2}=24\dfrac{1}{4}\)

\(x.2+\dfrac{7}{2}=\dfrac{97}{4}\)

\(x.2=\dfrac{97}{4}-\dfrac{7}{2}\)

\(x.2=\dfrac{97}{4}-\dfrac{14}{4}\)

\(x.2=\dfrac{83}{4}\)

\(x=\dfrac{83}{4}:2\)

\(x=\dfrac{83}{4}.\dfrac{1}{2}\)

\(x=\dfrac{83}{8}\)

\(x=10\dfrac{3}{8}\)

\(\dfrac{24}{x}:\dfrac{8}{3}=\dfrac{3}{5}\)

\(\dfrac{24}{x}=\dfrac{3}{5}.\dfrac{8}{3}\)

\(\dfrac{24}{x}=\dfrac{8}{5}\)

\(\dfrac{24}{x}=\dfrac{24}{15}\)

=>x=5

Vậy x=5

5225:[215-(3x-18)]=25

215-(3x-18)=5225:25

215-(3x-18)=209

3x-18=215-209

3x-18=6

3x=6+18

3x=24

x=24:3

x=8

Vậy x=8

C=120+(20:4-23). 3

C=120+(5-23).3

C=120+(-18).3

C=120+(-54)

C=66

D= (120+20:4-2²) .3

D=(120+5-4).3

D=(125-4).3

D=121.3

D=363

không hiểu bạn ơi cho đề bài rõ ra bạn ạ.

ab= 72

ex1: Fill in the blanks with the correct words

1. There are four seasons in ....the north ....... (the south / central / the north)

2. Where is HCM city? - It's in .....the south...... of Vietnam (the south / central / the north)

3. You can avoid ....accidents........ when you are careful (helmets / accidents / motorbikes)

4. Don't .....glide....... down the staircase (ride / swing / glide)

5. We went to Hanoi .....by...... train (with / on / by)

6. .......do not..... play with a sharp tool such as a knife (does not / did not / do not)

7. Get your sister to ......ride..... A helmet when she is on a bike or motorbikes ( wear / ride / glide)

8......never........ let your younger brother or sister play with lighters (always / sometimes / never)

9. Her ....dream..... house will be in the countryside (dream / small / beautiful)

10. My favourite detective ......story......... is Case Close (character / story / book)

1.his

2.those

3.noise

4.children

5.sitting

6.weaker

Híc,dài quá ta