Rewrite the fllowing sentences, using conditional sentence type II.

1. We haven't got any matches, so we can't light a fire.

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2. It's a pity we haven't got a steak to cook over our campfire.

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3. I don't have much time so I read very little.

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4. Because the buses are full up, they don't stop.

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5. He is tired so he can't score any goal.

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Rewrite the fllowing sentences, using conditional sentence type II.

1. She is very shy; that's why she doesn't enjoy parties.

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2. He doesn't take any morning exercises; that's why he is unhealthy.

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3. You work too fast. That's why you make so many mistakes.

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4. We have no ladder so we can't get over the wall.

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5. They don't clean the windows so the room look rather dark.

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Rewrite these sentences using if...................

1. Mary is very shy; that's why she doesn't enjoy parties.

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2. I don't have much time, so I read very little,

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3. We don't have central heating, so the house is very cold.

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4. He never shaves; that's why he looks unattractive.

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5. I'm fat, so I can't get through the bathroom window.

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Hoàn thành các câu sau với các từ ở trong ngoặc câu điều kiện loại 1 hoặc loại 2.

1. I ..................................... (call) the office if I was/ were you.

2. If the weather in fine, we (go) ............................................... siwmming in the sea.

3. If you ate less, you (not be) ................................................... healthy enough.

4. If I (have) ............................................... a typewriter, I would type it myself.

5. If he worked more slowly, he (not make) ..................................................... so many mistakes.

6. If I find it, I (give) ................................................... you a call.

7. If you (like) .................................................., I can get you a job in this company.

14. You could get a job easily if your degrees (be) ........................................................ good.

9. If he pays me tonight, I (have) .................................................... enough money for the tickets.

10. You (not have) .................................................. so much trouble if you and your car serviced regularly.

Cho A = x³y; B = x²y²; C = xy³.

Chứng minh rằng: A . C + B² - 2x⁴y⁴ = 0.

Cho đa thức P = 2x . (x + y - 1) + y² + 1.

a) Tính giá trị của P với x = -5; y = 3.

b) Chứng minh rằng P luôn luôn nhận giá trị không âm với mọi x, y.

Tìm đa thức f(x) rồi tìm nghiệm của f(x) biết rằng:

x³ + 2x² . (4y - 1) - 4xy² - 9y³ - f(x) = -5x³ + 8x²y - 4xy² - 9y³

Cho đa thức: f(x) = x² + mx + 2.

a) Xác định m để f(x) nhận -2 làm một nghiệm.

b) Tìm tập hợp các nghiệm của f(x) ứng với giá trị vừa tìm được của m.

Chứng minh các đẳng thức sau:

a) x² - y² = (x + y) . (x - y)

b) x³ + y³ = (x² - xy + y²)

c) a . (a - b) - b . (b - a) = a² - b²

d) a . (b - c) - b . (a + c) + c . (a - b) = -2bc

Tìm phép tu từ và chỉ ra từ chứa phép tu từ trong bài: "Qua đèo ngang", "Bạn đến chơi nhà"