(2a + 1)^2 + 2(2a + 1)(a - 1) + (a - 1)^2 при а = - 3,5срочно плизз. Created by ZelaousWhale27. algebra-ru

(2a + 1)^2 + 2(2a + 1)(a - 1) + (a - 1)^2 при а =

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(2a + 1)^2 + 2(2a + 1)(a - 1) + (a - 1)^2 при а = - 3,5
срочно плизз

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igundane

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$\left ( 2a+1 \right )^2+2\left ( 2a+1 \right )\left ( a-1 \right )+\left ( a-1 \right )^2\\\left ( 2a+1+a-1 \right )^2=9a^2\\a=-3,5\Rightarrow 9\cdot \left ( \frac{7}{2} \right )^2=9\cdot \frac{49}{4}=\frac{441}{4}$

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