$3x^2-8x+25=0$
$75\cdot1.95$
$\left(9x^3+\frac{2}{5}y\right)^2$
$15+16\cdot2-3\left(5\cdot2+4-3\cdot2\right)\left[2+2\cdot\left(-2\right)-9\right]\left(-5\right)$
$18x^2+24x$
$-4a^2-5b^2$
$2\sqrt{3}-4\sqrt{12}+5\sqrt{27}$
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