Question

Answer 1

6. Ông cần mua: \(\left(15\cdot6\right):\left(0,3\cdot0,3\right)=1000\left(viên\right)\left(C\right)\)

7. \(=\left(5x+1\right)\left(25x^2-5x+1\right):\left(5x+1\right)=25x^2-5x+1\left(B\right)\)

8. \(=\left(6x+1\right)^2:\left(6x+1\right)=6x+1\left(A\right)\)

9. \(=\dfrac{x}{2y^2}\left(D\right)\)

10. \(ĐK:2-5x\ne0\Leftrightarrow x\ne\dfrac{2}{5}\left(B\right)\)