[tex](-2)*(\frac{2}{4})^{2}-7*\frac{2}{4}+81=(-2)*\frac{4}{16}-\frac{14}{4}+81=\frac{-8}{16}-\frac{14}{4}+81 = \frac{-8-56+324}{16}= \frac{260}{16}=16,25[/tex]Ответ:
Объяснение:
(9-у)²-у(у+7)=(9-у)(9+у)-у²-7у=81+9у-9у-у²-у²-7у = -2у²-7у+81
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[tex](-2)*(\frac{2}{4})^{2}-7*\frac{2}{4}+81=(-2)*\frac{4}{16}-\frac{14}{4}+81=\frac{-8}{16}-\frac{14}{4}+81 = \frac{-8-56+324}{16}= \frac{260}{16}=16,25[/tex]Ответ:
Объяснение:
(9-у)²-у(у+7)=(9-у)(9+у)-у²-7у=81+9у-9у-у²-у²-7у = -2у²-7у+81