Là số 9. Vì 9 = 3³ (số mũ lớn hơn 1)

   1 tấn 12kg - 9 tạ 4 yến 

= 1012 kg - 940 kg

= 72 kg

1. Julia has full lips and white tooths. => teeth

2. He has heavy because he is a weight lifter. =>is

3. What color have your son's eyes? => is

4. Huong has an oval face and the small nose. => a

5. My friend has a short curcly hair. => curly

6. John is cold and he want some hot water. => wants

7. He is feel tired and hungry. => feels

8. Are there any milk for breakfast this morning? => ls

9. Would you like any noodles and an apple? => some

10. I like cabbagges and tomatoes. It's my favorite vegetables => cabbages

11. How much kilos of rice do you want? => many

12. My friend would like a can of soap.

13. How many is a box of chocolate? => much

14. At the carteen, a bowl of noodles are ten thousand dong. => ls

15. I need half a kilo of beefs. and some bananas.

16. How much is an ice-cream cost?

17. They have a day terrible at the zoo => terrible day

18. John would like to drinking a cup of coffee. => drink

19. There are any bananas and oranges for dinner. =>some

20. How much pork does Laura needs? => porks

    ​​​\(\left(x^2-2x+4\right)\left(x+2\right)-x\left(x-1\right)\left(x+1\right)+3=0\)​\(\Leftrightarrow x^2\left(x+2\right)-2x\left(x+2\right)+4\left(x+2\right)-x\left(x-1\right)\left(x+1\right)+3=0\)\(\Leftrightarrow x^3+2x^2-2x^2-4x+4x+8-\left[x^2\left(x+1\right)-x\left(x+1\right)\right]+3=0\)

\(\Leftrightarrow x^3+\left(2x^2-2x^2\right)+\left(-4x+4x\right)+8-\left(x^3+x^2-x^2-x\right)+3=0\)

\(\Leftrightarrow x^3+8-\left(x^3-x\right)+3=0\)

\(\Leftrightarrow x^3+\left(8+3\right)-x^3+x=0\)

\(\Leftrightarrow\left(x^3-x^3\right)+11+x=0\)

\(\Leftrightarrow11+x=0\)

\(\Leftrightarrow x=-11\)

Vậy x = -11

Ta có:

A = 234.234 = 234²

B = 233.235 = (234 - 1)(234 + 1) = 234² - 1

Ta thấy: 234² > 234² - 1

Hay: A > B (đpcm)

Những số chia hết cho 50 là những số chia hết cho cả 5 và 10 (hay những số chia hết cho 5 và có tận cùng là 10).

    \(\dfrac{3}{5}\times\left(x-2\right)-\dfrac{1}{7}=\dfrac{4}{9}\)

\(\Leftrightarrow\dfrac{3}{5}\times\left(x-2\right)=\dfrac{4}{9}+\dfrac{1}{7}\)

\(\Leftrightarrow\dfrac{3}{5}\times\left(x-2\right)=\dfrac{37}{63}\)

\(\Leftrightarrow x-2=\dfrac{37}{63}:\dfrac{3}{5}\)

\(\Leftrightarrow x-2=\dfrac{185}{189}\)

\(\Leftrightarrow x=\dfrac{185}{189}-2\)

\(\Leftrightarrow x=\dfrac{-193}{189}\)

Vậy \(x=\dfrac{-193}{189}\)

1, skates

2, doesn't

3, loves

4, sings

5, Do they

6, ask

7, hate 

8, doesn't

9, Do you

10, get

11, help

12, doesn't

13, work

14, ?

Cửa hàng đó có số khoai là:

    78 : 60% = 130 (kg)

Số kg khoai tây còn lại:

   130 - 78 - 42 = 10 (kg)

                        Đáp số: 10kg 

Chiều cao của Hà là :

   (96 + 134) : 2 = 115 (cm)

                         Đáp số : 115 cm