(a-0.3 )² - ( 7 + 4/3a) ( 7 - 4/3a ) = a²- 0.6a + 0.09 - 49 + 16/9a² = 2 7/9 a² - 0.6a -48.91
(а- 3)² + 6а = а² - 2*а*3 + 3² +6а = а² - 6а + 9 + 6а = а² + 9
при а = 7 ⇒ 7² + 9 = 49 + 9 = 58
8√х+5√у-√х-11√у=(<span>8√х-√х)+(5</span>√у<span>-11√у)=7</span>√х-6√у
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16
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26