Chieu rong mieng dat do la:

      100:5=20(m)

Dien h mieng dat do la:

      100x20=2000(m^2)

                   Dap so :2000m^2

Ung ho mk nha!

11+8=19

One rainy Saturday it was too wet to go...... (go) outside so I decided .to spend....... (spend) the day clearing out the attic. I was busy ..to clear...... (clear) away some papers when I noticed something which made me stop...... (stop) what I was doing. It was a dusty old diary. Without .hesitating....... (hesitate) I opened it and was surprised .to see......... (see) it had belonged to my grandmother, now dead. I spent the rest of the afternoon .reading....... (read) it and was surprised ..to learn....... (learn) many interesting things about her past. I knew it would be worth .having....... (have) it published. I was right and I have only one regret, I wish my grandmother could .have been....... (be) here to enjoy the fame.

3( x - 2 ) + 5 = 20

=> 3(x - 2) = 20 - 5

=> x - 2 = 15 : 3

=> x - 2 = 5

=> x = 5 + 2

=> x = 7

bạn có ai trả lời chưa cho mik coi v

2. It's very dark outside and you can't find your torch

You say, " .I could find my torch.........."

3. You didn't do your homework and your teacher is angry

You say, " ..I had done my homework........."

4. You are looking at a beautiful flower. You don't know what it is called

You say, " .I knew what it is called........."

5. It's raining outside and you want it to stop

You say, " ..It didn't rain........."

6. You stayed up late last night and today you're very tired

You say, " .I hadn't stayed up late last night.........."

7. You are having a party but nobody has come yet

You say, " .Someone came ......"

8. You have short, straight hair. You would like long, curly hair

You say, " ..I had long, curly hair........."

9. You have just left your house and left the keys inside

You say, " .I hadn't left the keys inside my house.........."

10. It is Christmas Day and it doesn't look like it is going to snow

You say, " .It would snow.........."

11. You live in the city. You prefer the countryside

You say, " ..I lived in the countryside........."

5x5x5x5x5x5x5x5x5x5

=25x25x25x25x25

=625x625x25

=390625x25

=9765625

Vậy tuổi anh hơn tuổi em là:

32 - 27 = 5 ( tuổi ) 

Đến năm 2000, tuổi anh là:

5 : ( 3 - 2 ) . 3 = 15 ( tuổi )

Tuổi mẹ năm 2004 là:

15 + 27 + 4 = 46 ( tuổi )

Ta có : \(B=\frac{14x^2-8x+9}{3x^2+6x+9}=\frac{2\left(x^2+2x+3\right)+\left(12x^2-12x+3\right)}{3\left(x^2+2x+3\right)}\)

\(=\frac{12\left(x-\frac{1}{2}\right)^2}{3\left(x^2+2x+3\right)}+\frac{2}{3}\ge\frac{2}{3}\) . Dấu "=" xảy ra khi x = 1/2

Vậy Min B = 2/3 khi x = 1/2