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a) \(\frac{30x^3}{11y^2}.\frac{121y^5}{25x}=\frac{6x^2.11y^3}{5}=\frac{66x^2y^3}{5}\)
b) \(\frac{x+3}{x^2-4}.\frac{8-12x+6x^2-x^3}{9x+27}=\frac{x+3}{\left(x-2\right)\left(x+2\right)}.\frac{\left(2-x\right)^3}{9\left(x+3\right)}\)
\(=\frac{-\left(x-2\right)^2}{9\left(x+2\right)}\)
p/s: chúc bạn học tốt
\(\frac{x+3}{x^2-4}.\frac{8-12x+6^2-x^3}{9x+27}\)
\(=\frac{x+3}{x^2-4}.\frac{-x^3+6x^2-4}{9x+27}\)
\(=\frac{\left(x+3\right)\left(-x^3+6x^2-4\right)}{\left(x^2-4\right)\left(9x+27\right)}\)
\(=\frac{\left(x+3\right)\left(-x^3+6x-4\right)}{9\left(x+3\right)\left(x^2-4\right)}\)
\(=\frac{-x^3+6x^2-4}{9\left(x^2-4\right)}\)
Mk ko chắc
(x+3 )/ (x-2)(x+2) . [(2-x)^3 / 9(x+3)]
= -(x-2)^2 / [(x+2).9]
= \(\left[\frac{x.\left(x+3\right)}{\left(x+3\right).\left(x^2+9\right)}+\frac{3}{x+9}\right]:\left[\frac{1}{x-3}-\frac{6x}{\left(x-3\right)\left(x^2+9\right)}\right]\) ]
\(=\frac{x+3}{x^2-9}.\frac{\left(x-3\right).\left(x^2+9\right)}{x^2+9-6x}\)
= \(\frac{\left(x-3\right).\left(x+3\right)}{\left(x-3\right)^2}\)
= \(\frac{x+3}{x-3}\)
k mik nhé. Plssss~
\(\frac{x+3}{x^2-4}.\frac{8-12x+6x^2-x^3}{9x+27}\)
\(=\frac{\left(x+3\right)\left(2-x\right)^3}{\left(x+2\right)\left(x-2\right).9\left(x+3\right)}\)
\(=-\frac{\left(x-2\right)^2}{9\left(x+2\right)}\)
Cảm ơn bạn nha