$\left(-4\right)\left(-26\right)$
$2x+1\ge-1x+1$
$\int_2^5\left(vx-5\left(x-2\right)\right)xdx$
$\left(x+2\right)^2=x^2+4x+4$
$-5,3b^{2}\times20,6b^{2}\times$
$\frac{81x^{8}-16}{3x^{2}+2}$
$2 ^ { 2 x } + 20 - 9 \cdot 2 ^ { x } = 0$
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