Rút gọn các phân thức sau:
a. \(A = \frac{{45x \left( {2 - x} \right)}}{{15x{{ \left( {x - 2} \right)}^2}}} \)
b. \(B = \frac{{{x^3} + 2{x^2}y - x{y^2} - 2{y^3}}}{{{x^2} + 3xy + 2{y^2}}} \)
A.\(\begin{array}{l}a)\,\,A = \frac{3}{{2 - x}}\\b)\,\,B = x - y\end{array}\)
B.\(\begin{array}{l}a)\,\,A = \frac{{ - 3}}{{2 - x}}\\b)\,\,B = x + y\end{array}\)
C.\(\begin{array}{l}a)\,\,A = \frac{3}{{2 + x}}\\b)\,\,B = x + 2y\end{array}\)
D.\(\begin{array}{l}a)\,\,A = \frac{3}{{x - 2}}\\b)\,\,B = 2x - y\end{array}\)
a. \(A = \frac{{45x \left( {2 - x} \right)}}{{15x{{ \left( {x - 2} \right)}^2}}} \)
b. \(B = \frac{{{x^3} + 2{x^2}y - x{y^2} - 2{y^3}}}{{{x^2} + 3xy + 2{y^2}}} \)
A.\(\begin{array}{l}a)\,\,A = \frac{3}{{2 - x}}\\b)\,\,B = x - y\end{array}\)
B.\(\begin{array}{l}a)\,\,A = \frac{{ - 3}}{{2 - x}}\\b)\,\,B = x + y\end{array}\)
C.\(\begin{array}{l}a)\,\,A = \frac{3}{{2 + x}}\\b)\,\,B = x + 2y\end{array}\)
D.\(\begin{array}{l}a)\,\,A = \frac{3}{{x - 2}}\\b)\,\,B = 2x - y\end{array}\)
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