THAM KHẢO:

v chọn B

b) \(\left(x-1\right)\left(x^2+x+1\right)-x\left(x+2\right)\left(x-2\right)=5\)

\(x^3-1^3-x\left(x^2-4\right)=5\)

\(x^3-1-\left(x^3-4x\right)=5\)

\(x^3-1-x^3+4x=5\)

\(-1+4x=5\)

\(4x=6\)

\(x=\dfrac{3}{2}\)

\(\left(x-1\right)\left(x^2+x+1\right)-x\left(x+2\right)\left(x-2\right)=5\)

\(\Leftrightarrow x^3-1-x^3+4x=5\)

\(\Leftrightarrow4x=6\)

hay \(x=\dfrac{3}{2}\)

Đặt câu

My father works in the hospital.

-Where does your father work?

Đặt câu

My father works in the hospital.

-Where does your father work ?

chúc bn hk tốt

My father works in the hospital.

- Where does your father work?

Chúc bạn học tốt

1/2x^2=4-x

=>x^2=8-2x

=>x^2+2x-8=0

=>(x+4)(x-2)=0

=>x=2; x=-4

Phương trình trạng thái khí lí tưởng:

\(\dfrac{p_1\cdot V_1}{T_1}=\dfrac{p_2\cdot V_2}{T_2}\)

\(\Rightarrow\dfrac{4\cdot6}{293}=\dfrac{p_2\cdot4}{313}\)

\(\Rightarrow p_2=6,41atm\)

Chọn A

D