$\left(+4\right)\cdot\left(-11+5-6+2\right)$
$\left(-5a^2b\right)\left(-12a^3b^3\right)$
$4.9\cdot4.9$
$2xy-y-x-x$
$3.5m^3n^2-2.5m^3n^2$
$\frac{3x^4-2x^2+x+3}{x^2+2}$
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