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5.E: Поліноміальні функції (вправи)
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25) $-5 x+3-6 x^{3}+5 x^{2}-9 x+3-3 x^{2}+6 x^{3}$ 27) $4 x^{3}+6 x^{2}-8 x+1+8 x^{3}-7 x^{2}+5 x-8$ 28) $-8 x^{3}-2 x^{2}-7 x-3+7 x^{3}-9 x^{2}-8 x+9$ 33)\(-8 x^{2}-4 x z-2 z^{2}-3 x^{2}-8 x z+2 z...25) $-5 x+3-6 x^{3}+5 x^{2}-9 x+3-3 x^{2}+6 x^{3}$ 27) $4 x^{3}+6 x^{2}-8 x+1+8 x^{3}-7 x^{2}+5 x-8$ 28) $-8 x^{3}-2 x^{2}-7 x-3+7 x^{3}-9 x^{2}-8 x+9$ 33) $-8 x^{2}-4 x z-2 z^{2}-3 x^{2}-8 x z+2 z^{2}$ 34) $-5 x^{2}+9 x z-4 z^{2}-6 x^{2}-7 x z+7 z^{2}$ 40) $8 x^{2}+x y+3 y^{2}-x^{2}+7 x y+y^{2}$ 42) $7 x^{3}-9 x^{2} y+3 y^{3}+7 x^{3}+3 x y^{2}-7 y^{3}$ 29) $\begin{aligned}f(x)&=-6 x^{3}-7 x+7 \\ g(x)&=-3 x^{3}-3 x^{2}-8 x\end{aligned}$