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\frac{330x_{1}^{2}\times 0\times 0x_{50}}{160}
Multiply x_{1} and x_{1} to get x_{1}^{2}.
\frac{0x_{1}^{2}\times 0x_{50}}{160}
Multiply 330 and 0 to get 0.
\frac{0x_{1}^{2}x_{50}}{160}
Multiply 0 and 0 to get 0.
\frac{0}{160}
Anything times zero gives zero.
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Zero divided by any non-zero number gives zero.
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Simplify.
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