$1,17a-2,15a-3,25a+4,141$
$v^2+v-30$
$3.25\cdot4.8$
$\frac{5}{5^7}^{-2}$
$\int\frac{sen^2x+cos^3x}{sen^6x}dx$
$ab-3a$
$-\frac{9x}{2}-1<2-5x$
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