$\sqrt{x^x}$
$20x^2-x=0$
$19\cdot4\frac{3}{5}-2.75-12\frac{1}{2}$
$2x^2-5x+1^2$
$\frac{ab^{-1}ab}{ab^{-1}b^{-2}}$
$\sin^2x+3=4-\cos^2x$
$x^2+2xy+x^2$
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