To find an expression that equals 811, let's evaluate each option one by one:
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11 - 8: \[ 11 - 8 = 3 \]
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11 ÷ 8: \[ 11 \div 8 = 1.375 \]
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8 - 11: \[ 8 - 11 = -3 \]
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8 ÷ 11: \[ 8 \div 11 \approx 0.727 \]
None of these expressions equals 811. Therefore, none of the given expressions are equal to 811.