Tính nhanh:

a) 1723 - 23³/104 + 127. 23

b) 66³ + 34³/100 - 66. 34

c) 43² - 11²/ 36,5² - 27,5²

d) 621² - 769. 373 - 148²

Cho a + 1 = 1. Tính:

A = a³ + b³ + 3ab. (a² + b²) + 6a²b². (a + b)

Tìm x, biết:

a) 6. (x + 1)² + 2. (x - 1). (x² + x +1) - 2. (x + 1)³ = 32

b) 5x. (x - 3)² - 5. (x - 1)³ + 15. (x + 2). (x - 2) = 5

Điền vào chỗ chấm:

a) 125x³ + .......... + .......... + .......... = ( .......... + 2y² )³

b) .......... - .......... + .......... - 64x³ = ( 3 - .......... )³

c) .......... + .......... + .......... + 125y⁶ = ( 1/3x + .......... )³

d) .......... - .......... + .......... - 1/27y³ = ( 1/6x² - .......... )³

1. Thu gọn:

a) (3x-1). (x-2) + (x-1). (x+1)

b) (4x-3). (2x-5) - (8x-2). (x-1)

2. Tìm x:

a) 3x. (x-3) - x. (3x-2) = 2

b) -2x. (x+1) - 3. (1-x) + 2x² = 3

c) (x-2). (x+2) + (3.x). (x+1) = 0

d) (2x-1). (x+3)- (x-2). (2x+1) = 10

Change these sentences into Reported Speech:

Reported speech with to infinitive

1. She said to him: "give me another glass of wine".

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2. She said to me: "bring me a book".

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3. Mother said to him: "open the window please!"

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4. He said to me: "shut the door after you".

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5. The captain said to them: "wait here still I come back".

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6. She told her: "take it and come with me".

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7. He said to me: "don't come back before one o'clock".

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8. My mother told me: "don't forget to look at the door".

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9. He said to his brother: "don't open the window, open the door".

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10. He said to girl: "don't sit on my bed, sit on this chair please!".

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