$\lim_{x\to1}3$
$\frac{m^{-3}n^9}{m^6n^{12}}$
$2x+2-8x+3$
$4x^2-40x+100$
$21ab-7b+14$
$u^2-5u+2$
$\:2,5a-0,4a-3,6a+4a$
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