Cho các phân thức \(\dfrac{2}{{{x^2} - 1}};\,\,\dfrac{x}{{{x^2} + 2x + 1}}\). Phân thức \(\dfrac{2}{{{x^2} - 1}}\) sau khi quy đồng mẫu là
A.\(\dfrac{{2\left( {x + 1} \right)}}{{\left( {x - 1} \right){{\left( {x + 1} \right)}^2}}}\)
B.\(\dfrac{{2{{\left( {x + 1} \right)}^2}}}{{\left( {x - 1} \right){{\left( {x + 1} \right)}^2}}}\)
C.\(\dfrac{{2\left( {x + 1} \right)}}{{\left( {x - 1} \right)\left( {x + 1} \right)}}\)
D.\(\dfrac{2}{{\left( {x - 1} \right)\left( {x + 1} \right)}}\)
A.\(\dfrac{{2\left( {x + 1} \right)}}{{\left( {x - 1} \right){{\left( {x + 1} \right)}^2}}}\)
B.\(\dfrac{{2{{\left( {x + 1} \right)}^2}}}{{\left( {x - 1} \right){{\left( {x + 1} \right)}^2}}}\)
C.\(\dfrac{{2\left( {x + 1} \right)}}{{\left( {x - 1} \right)\left( {x + 1} \right)}}\)
D.\(\dfrac{2}{{\left( {x - 1} \right)\left( {x + 1} \right)}}\)
Loga
Hóa Học lớp 12
