Tính

a) \(\left(3x^2-2y\right)^3\)

b) \(\left(\frac{1}{2}x^2+\frac{1}{3}y\right)^3\)

tìm x biết

1) \(\left(x+2\right)-\left(x^2-2x+4\right)-x\left(x^2+2\right)=15\)

2) \(\left(x+3\right)^3-x\left(3x+1\right)^2+\left(2x+1\right)\left(4x^2-2x+1\right)=28\)

1. Jack is ................ his jokes make his friends laugh a lot.

A. generous B. humorous C. easy - going D.unusual

1 . a. young b. about c.account d.sound

2. a.blind b.mint c.hire d.light

3. a. hurl b.pull c.June d.would

Base on the cues to complete the sentences.

1. Nam/spend/most/free time/play soccer.

2. When/we/children/we/used/listen/grandma's old folktales after dinner.

3. You/can/tell me/best ways/learn new word?

4. I/write down/all new words/small notebook.

5. They/going/visit/homevillage/weekend.

Supply the correct verbs form.

1. Mary and John are neighbors. They (know) each other for a long time.

2. My mother is tired enough (cook) tonight.

3. My teacher askes me (not make) noise in class.

Choose the correct answers:

1. Is this a peason / the peason you told me about?

2. This is the only cinema / an only cinema in the area.

3. Are you going to church / the church on Sunday?

4. Do you have a milk jug / milk jug?

5. I have go to I'm in a hurry / hurry.

6. I managed to sell the old painting at a profit / at profit.

7. I was in pain / in a pain after I twist my ankle.

8. Excuse me, but you're in the way / in a way.

bài 1: Tìm GTNN của các biểu thức sau:

a) \(A=x^{2^{ }}-3x+4\)

b) \(B=2x^2-4x+1\)

c) \(C=4x^{2^{ }}-4x\)

Bài 2: Tìm GTLN của các biểu thức sau:

a) \(A=-x-4x+2\)

b) \(B=\left(x+4\right)\left(2-x\right)\)

Bài 3: Tính giá trị của các biểu thức sau:

a) \(A=9x^2+42x+49\) với \(x=1\)

b) \(B=\left(x+y\right)^3-x^{2^{ }}+2xy-y^2\) với \(x-y=-5\)

tính nhẩm

a) 125² + 150 . 125 + 75²

b) 93 . 107