<span>7х+9>9х-8
7х-9х>-8-9
-2x>-17
x<8,5
x∈(-∞;8,5)</span>
<span>task/26097048
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Разложите на множители многочлен a⁵+a+1
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решение :
</span>a⁵+a+1 =(a⁵ -a²) +(a² +a+1) =a²(a³ -1) + (a² +<span>a+1) =
</span>=a²(a -1)(a² +a+1) + (a² +a+1) =(a² +a+1)(a²(<span>a -1) +1) =
</span>(a² +a+1)(a³<span> - a</span>²<span>+1) .</span>