$x\left(y^2+y+1\right)+y\left(x^2+x+1\right)+x^2+y^2$
$0.84\cdot0.47$
$\frac{dr}{dq}=100\sqrt{q}+20q$
$9x-4=12x-55$
$3x^2-6x-72$
$\left(b^{5+9}\right)^2+2.b^{5+9}+\left(b^{5-2}\right)^2$
$\sqrt[3]{x^4}+x+2$
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