$a^2b^2+a^3b^3-ab$
$\frac{1-y^{12}}{1-y^4}$
$\frac{4x^2-3}{2x}$
$5x^2-3x-6$
$+2.1-3.6$
$\left(0.5\cdot1.6\right)+\left(0.5\cdot1.8\right)$
$10^3+-10^3+10^2+-10^2$
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