Question

Answer 1

Câu 1:A 

Câu 2: B

Câu 3: C

Câu 4: B

Câu 5: \(\dfrac{5x+5}{xy^2}:\dfrac{10\left(x+1\right)}{3x^2y}\)

\(=\dfrac{5\left(x+1\right)}{10\left(x+1\right)}\cdot\dfrac{3x^2y}{xy^2}=\dfrac{1}{2}\cdot\dfrac{3x}{y}=\dfrac{3x}{2y}\)

=>Chọn C

Câu 6: \(\dfrac{x^2+4}{x-2}-\dfrac{4x}{2-x}=\dfrac{x^2+4+4x}{x-2}=\dfrac{\left(x+2\right)^2}{x-2}\ne x-2\)

=>Loại A

\(\dfrac{x^2+4}{x-2}+\dfrac{4x}{2-x}=\dfrac{x^2+4-4x}{x-2}=\dfrac{\left(x-2\right)^2}{x-2}=x-2\)

=>Chọn B

Câu 7: 2x-1=11

=>2x=12

=>x=6

=>Chọn D

Câu 8: \(2x-2=0\)

=>2x=2

=>x=1

Khi x=1 thì \(3x^2+2=3\cdot1^2+2=5\)

=>Chọn D

Câu 9: D