Question

Thực hiên cá phép tính sau

a) \(\frac{3}{2x+6}-\frac{x-6}{2x^2+6x}\)

b) \(\frac{12x}{5y^3}-\frac{15y^4}{8x^3}\)

c) \(\frac{x^2-4}{3x+12}\) \(\frac{x+4}{2x-4}\)

Answer 1

a)\(\Rightarrow\frac{3}{2.\left(x+3\right)}-\frac{x-6}{2x.\left(x+3\right)}\)

\(\Rightarrow\frac{3x-x+6}{2x.\left(x+3\right)}\)

\(\Rightarrow\frac{2x+6}{2x.\left(x+3\right)}=\frac{2.\left(x+3\right)}{2x.\left(x+3\right)}=\frac{2}{2x}=\frac{1}{x}\)

Answer 2

b

=\(\frac{96x^4-75y^7}{40x^3y^3}\)

c, phan tich ra:

=\(\frac{\left(x-2\right)\left(x+2\right)}{3\left(x+4\right)}.\frac{x+4}{2\left(x-2\right)}=\frac{x+2}{6}\)

=