$$\left. \begin{array} { l } { y = 900 } \\ { 45 \cdot 80 \div 6 \cdot 342 } \end{array} \right.$$
$z=205200$
$$z=\frac{3600}{6}\times 342$$
$$z=600\times 342$$
$$z=205200$$
$$y=900$$ $$z=205200$$
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