сократите дробь:
х^2-x-20
__________
x+4
(х²-х-20)/(х+4)=(х+4)(х-5)/(х+4)=х-5.
(х^2-x-20)/(x+4)=(x-5)*(x+4)/(x+4)=x-5
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(х²-х-20)/(х+4)=(х+4)(х-5)/(х+4)=х-5.
(х^2-x-20)/(x+4)=(x-5)*(x+4)/(x+4)=x-5