$3+2\left(-2-3\right)-7\left(1-5\right)$
$12.65\cdot1$
$\left(x+y\right)\cdot18$
$4x^2+12xy+6y^2$
$432\cdot 555$
$\left(4ab^2-5c^3\right)^2$
$\lim_{x\to2}\left(-16x^2+144\right)$
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