докажите что при любом значении "а" значение выражения постоянно
[tex](a + 5)^{2} - (a + 5)(a - 8) + (8 - a) ^{2} [/tex]
[tex](a + 5)^{2} - (a + 5)(a - 8) + (8 - a) ^{2} [/tex]
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