Question

Thực hiện phép tính sau:

a) \(2x\left(1+\dfrac{1}{2}x^2-\dfrac{5}{2}x^3\right)\)

b) \(\dfrac{4x}{2x-1}-\dfrac{7x+3}{4x^2-1}\)

 

 

Answer 1

a: \(=2x+x^3-5x^4\)

b: \(=\dfrac{8x^2+4x-7x-3}{\left(2x-1\right)\left(2x+1\right)}=\dfrac{8x^2-3x-3}{\left(2x-1\right)\left(2x+1\right)}\)