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(B) The sum of the given numbers is $12.11 + 18.0 + 1.012 = 31.122$.According to the rules for significant figures in addition or subtraction, the fin

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$31.1$

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(B) The sum of the given numbers is $12.11 + 18.0 + 1.012 = 31.122$.According to the rules for significant figures in addition or subtraction, the final result should be reported to the same number of decimal places as the term with the fewest decimal places.Here, $18.0$ has the fewest decimal places (one decimal place).Therefore, the result should be rounded to one decimal place, which is $31.1$.

According to the significant figure convention, the result obtained by adding $12.11$, $18.0$, and $1.012$ is:

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