Упростите выражение.
A) [tex] \frac{1}{x-5} - \frac{9}{ x^{2} - x - 20} [/tex]
Б) [tex] \frac{1}{a+7} + \frac{10}{21-4a- a^{2} } [/tex]
A) [tex] \frac{1}{x-5} - \frac{9}{ x^{2} - x - 20} [/tex]
Б) [tex] \frac{1}{a+7} + \frac{10}{21-4a- a^{2} } [/tex]
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А) х²-х-20=0Д=1+80=81
х(1)=(1+9)/2=5
х(2)=(1-9)/2=-4
Б) 21-4a-a²=0
a²+4a-21=0
D=16+84=100
a(1)=(-4+10)/2=3
a(2)=(-4-10)/2=-7