2. No other runner is quicker than her.

3. She makes fewer mistakes than last time.

5. Jurassic Park was directed by Steven Spielberg.

8. The last time John did housework was a month ago.

trả lời :

bài đâu bn

^HT^

@Lê Mạnh Hùng đây nhé

sorry mk ngủ đây

1. I enjoy playing sports because it is good for my health

2. Do your children go camping every summer holiday?

3. I think photography can be an expensive hobby.

4. My cousin will give me a book as a gift on my next birthday.

5. He finds mountain climbing dangerous so he doesn't take it

6. I hope in the future he will teach me how to do eggshell carving.

1. I enjoy playing sports because it's good for health.
2.Does your children go camping every summer holiday?
3.I think photography can be a expensive hobby
4.My cousin gives me a book to gift my next birth day
5.He finds mountain climbing dangerous, so he doesn't take it.
6.I hope in the future, he will teach me how to do eggshell carving
----Cái này mk tự làm nên ko chắc là đúng đâu nhé----

Ta có \(x.\left(x^2+x+1\right)-x^2.\left(1+x\right)-x-7\)

\(=x^3+x^2+x-x^2-x^3-x-7\)

\(=\left(x^3-x^3\right)-\left(x^2-x^2\right)-\left(x-x\right)-7\)

\(=-7\)

Do đó  giá trị của biểu thức không phụ thuộc vào biến

Vậy...

Mik ghi nhầm " biểu thức nào sau đây ko phụ thuộc vào biến" mới đúng nha

shorrt curly black hair

My sister is old enough to drive a car

He is tall enough to reach the top of the bookshelf

easy enough for me to do

                                      Bài làm :

Ta có :

(3x+5)(2x-7)

=3x(2x-7) + 5(2x-7)

=6x² - 21x + 10x - 35

= 6x² - 11x +35

Chúc bạn học tốt !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

\(\left(3x+5\right)\times\left(2x-7\right)\)

\(=6x^2-21x+10x-35\)

\(=6x^2-11x-35\)

a) Diện tích xung quanh của khối rubik là:

\(\dfrac{1}{2}\cdot234\cdot67,5=7897,5\left(mm^2\right)\)

Diện tích mỗi mặt của khối rubik là:

\(7897,5:3=2632,5\left(mm^2\right)\)

Diện tích toàn phần của khối rubik là:

\(2632,5\cdot4=10530\left(mm^2\right)\)

\(---\)

b) Thể tích của khối rubik là:

\(\dfrac{1}{3}\cdot2632,5\cdot63,7=55896,75\left(mm^3\right)\)

Vậy: ...

#\(Toru\)

a)\(x\left(x-3\right)-2x+6=0\)

\(\Leftrightarrow x\left(x-3\right)-2\left(x-3\right)=0\)

\(\Leftrightarrow\left(x-2\right)\left(x-3\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x-2=0\\x-3=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=2\\x=3\end{cases}}\)

b)\(\left(3x-5\right)\left(5x-7\right)+\left(5x+1\right)\left(2-3x\right)=4\)

\(\Leftrightarrow15x^2-46x+35-15x^2+7x+2-4=0\)

\(\Leftrightarrow33-39x=0\Leftrightarrow33=39x\Leftrightarrow x=\frac{33}{39}\)

a) \(x\left(x-3\right)-2x+6=0\)

\(x\left(x-3\right)-2\left(x-3\right)=0\)

\(\left(x-3\right)\left(x-2\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-3=0\\x-2=0\end{cases}\Rightarrow\orbr{\begin{cases}x=3\\x=2\end{cases}}}\)

b) \((3x-5)(5x-7)+(5x+1)(2-3x)=4\)

\(15x^2-46x+35+10x-15x^2+2-3x-4=0\)

\(33-39x=0\)

\(3\left(11-13x\right)=0\)

\(11-13x=0\)

\(13x=11\)

\(x=\frac{11}{13}\)

lớp11