$60\cdot50$
$\frac{a^4b^2}{16}-1$
$\int x^2sin\left(-x\right)dx$
$a^7\left(a^8\right)$
$x^2y^2+4bxy^2+4b^2y^2$
$15ax+25bx+30cx$
$216y^4+y$
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