Tính giá trị của biểu thức:
16x²y⁵-2x³y² với x=0,5 và y=-1

Tính tổng các đơn thức sau:
\(\dfrac{3}{4}\)xyz²+\(\dfrac{1}{2}\)xyz²+\(\dfrac{-1}{4}\)xyz²

1.Tính tích các đơn thức sau:
a) 3xy³ và x⁴y2
b) \(\dfrac{12}{15}\)x⁴y² và -5xy3
c) ^-\(\dfrac{1}{7}\)x²y và -\(\dfrac{2}{5}\)xy⁴

Làm bài toán sau:
a) (1/3x²y) . (15xy³)
b) (3/5x³y) . (-2x³y⁵)
c) (-1/2x²y) . (2xy³) . (-5/8x³y³)

Use suitable comparative forms and tense of verb to complete the sentences:
1. Tomorrow you (get) there (fast) if you take the train.
2. Mrs.Kim always (talk) a bit  (loud) than her husband.
3. Mary usually (sing) (beautiful) than her sister does.
4. Yesterday Linda (dance) (graceful) than other members in her club.
5. Since my new colleagues came, they (work) (hard) than my old ones.
6. At night, you should (drive) (slow) than during the day.

Complete the sentences below:
1. How far it (tobe)___from your grandma's home to the market?
2. Where you (go)___yesterday?
3. What you (do)___when I called you yesterday?
4. How long you (live)___in Saigon?
5. You (no do homework)___now?
6. How often she (clean)___her room?
7. Nam's sister (not usually go shopping)___in the Saturday morning.
8. He (not take slower)___(since/for) he came back home.
9. Mai (don't mind/make crafts)___at home.
10. She (like/cook)___the Chinese food for special occasions.