1)-(-3)³-(2x+1)³=152

    27-(2x+1)³=152

          (2x+1)³=27-152

          (2x+1)³=-125

          (2x+1)³=(-5)³

           2x+1=-5

           2x=-4

             x=-4:2

             x=-2

Vậy x=-2

a: f(-1)=-03

f(0)=-2

b: f(x)=3

=>x-2=3

hay x=5

ĐK: 2x -1 ≥ 0 ⇔ x ≥ \(\frac{1}{2}\)

\(\left(x-1\right)\sqrt{2x-1}=3\left(x^2-5x+4\right)\)

⇔ (x -1)\(\sqrt{2x-1}\) = 3(x - 4)(x - 1)

- Xét x = 1 ta thấy là nghiệm của phương trình (1)

- Xét x≠ 1: \(\sqrt{2x-1}=3\left(x-4\right)\) (x ≥ 4)

⇔ 2x -1 = 9x² -72x + 144

⇔\(\left[{}\begin{matrix}x=5\left(TM\right)\left(2\right)\\x=\frac{29}{9}\left(KTM\right)\end{matrix}\right.\)

Từ (1), (2) suy ra nghiệm của phương trình là \(\left[{}\begin{matrix}x=1\\x=5\end{matrix}\right.\)

\(n_{HCl}=\dfrac{1}{36,5}=0,027\left(mol\right)\)

\(n_{NaOH}=\dfrac{1}{40}=0,025\left(mol\right)\)

\(HCl+NaOH\rightarrow NaCl+H_2O\)

Lập tỉ lệ : \(\dfrac{0,027}{1}>\dfrac{0,025}{1}\)=> Sau phản ứng HCl dư

Vậy khi nhúng quỳ tím vào dung dịch sau phản ứng, quỳ tím hóa đỏ 

Ta có: HCl + NaOH → NaCl + H₂O

=> Quỳ tím ko chuyển màu

1 My parents go shopping twice a week

2 Hoa's house has a balcony

3 My brother usually plays badminton with his friends

4 My favorite book is Tam and Cam. What is yours?

5 There are 10 pencil cases on the table

1, My parents go shopping twice a week.

2, Hoa's house has a balcony.

3, My brother usually plays badminton with his friends.

4, My favorite book is Tam and Cam. What's yours?

5, There are ten pencil cases on the table.