$-3\frac{1}{4}x\left(-2\frac{3}{5}\right)$
$9a^2-49$
$10^4\cdot10^3\cdot10^{-5}$
$400-127,7$
$6^{-2}\cdot6^5$
$4x^2-9y^2=36$
$\int x^3\cdot\sqrt{1+6x^4}dx$
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