$15a^2b^3.5a^2\:b^5\cdot$
$\left(2x^2+8\right)^5$
$x^2+21x+3$
$\frac{x^2-2x-5}{x+1}$
$g^2=49$
$3x^2-11x+1\cdot4x+2$
$-4x^2y.x^2-3y$
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