Question

quy đồng mẫu thức (giúp mình đi mình cần gấp lắm)

Answer 1

c: \(\dfrac{x-7}{9-x^2}=\dfrac{2x-14}{2\left(3-x\right)\left(3+x\right)}\)

\(\dfrac{3+2x}{2\left(3-x\right)}=\dfrac{\left(2x+3\right)\left(x+3\right)}{2\left(3-x\right)\left(3+x\right)}=\dfrac{2x^2+9x+9}{2\left(3-x\right)\left(3+x\right)}\)

d: \(\dfrac{x}{2x+4}=\dfrac{7x\left(x+2\right)}{14\left(x+2\right)^2}\)

\(\dfrac{x-1}{7x^2+28x+28}=\dfrac{2\left(x-1\right)}{14\left(x+2\right)^2}\)