ko có chi

cậu có giúp đỡ tớ đâu 

Theo mk là axit lactic nha

Axit lactic nha

b và c

B và D

\(54+\left(-253\right)+46+53\\ =\left(54+46\right)+\left[\left(-253\right)+53\right]\\ =100+\left(-200\right)\\ =-100\)

`54+(-253)+46+53`

`=(-253+53)+(54+46)`

`= -200 + 100`

`=-100`

Bỏ () Rồi tính nhé
 

Bn cắt ra cho mn dễ làm nha

Bài 11:

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

b: \(25x^2-\dfrac{9}{100}=\left(5x-\dfrac{3}{10}\right)\left(5x+\dfrac{3}{10}\right)\)

c: \(9x^2-\dfrac{1}{4}=\left(3x-\dfrac{1}{2}\right)\left(3x+\dfrac{1}{2}\right)\)

d: \(\left(x-y\right)^2-4=\left(x-y-2\right)\left(x-y+2\right)\)

Me: What are you doing on Sunday afternoon?

Friend: I’m not doing anything. / Nothing much.

Me: Do you want to see a movie with me?

Friend: Sure. What movie is it?

Me: It's "The Journey to Mars".

Friend: What time does it start?

Me: It starts at 4 p.m.

Friend: Great! See you then.

Me: What are you doing on Saturday morning?

Friend: I’m free.

Me: Would you like to go to the movies with me?

Friend: Sounds good. What movie do you want to watch?

Me: How about "The Forest Book"?

Friend: What time is it on?

Me: It's at 10 a.m.

Friend: OK, let's meet at the cinema at 9:45.

a: Diện tích mỗi khu vực 16m50 là:

\(165\cdot400=66000\left(dm^2\right)=660\left(m^2\right)\)

Số tiền phải trả là:

\(660\cdot2\cdot350000=660\cdot700000=462000000\) (đồng)