12) Упростите
a)[tex] \frac{x+1}{x+2} - \frac{ x^{2} -4}{ x^{2} +2x} : \frac{ x^{2} -4x+4}{ x^{2} +x} [/tex]
b)[tex] \frac{2-x}{x-4} + \frac{ x^{2} -2x-3}{ x^{2} -x-6} * \frac{ x^{2} +2x}{ x^{2} -4x} [/tex]
13) Найдите a и b из тождества [tex] \frac{5}{ x^{2} +x-6} = \frac{a}{x-2} + \frac{b}{x+3} [/tex]
a)[tex] \frac{x+1}{x+2} - \frac{ x^{2} -4}{ x^{2} +2x} : \frac{ x^{2} -4x+4}{ x^{2} +x} [/tex]
b)[tex] \frac{2-x}{x-4} + \frac{ x^{2} -2x-3}{ x^{2} -x-6} * \frac{ x^{2} +2x}{ x^{2} -4x} [/tex]
13) Найдите a и b из тождества [tex] \frac{5}{ x^{2} +x-6} = \frac{a}{x-2} + \frac{b}{x+3} [/tex]
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