Question

Determinati numarul 2xy + 12xz , stiind ca x =35 si y+6z=400

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Answer 1

$\it x=35\ \ \ \ \ \ \ \ \ (1)\\ \\ y+6z=400\ \ (2)\\ \\ 2xy+12xz=2x(y+6z)\ \stackrel{(1),(2)}{=}\ 2\cdot35\cdot 400$