To simplify the expression \( (1.1 - 0.3) \div 8 + 4 \times 3 \), we follow the order of operations (parentheses, exponents, multiplication and division from left to right, addition and subtraction from left to right).
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First, solve the parentheses: \[ 1.1 - 0.3 = 0.8 \]
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Now, substitute back into the expression: \[ 0.8 \div 8 + 4 \times 3 \]
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Next, perform the division and multiplication: \[ 0.8 \div 8 = 0.1 \] \[ 4 \times 3 = 12 \]
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Now, substitute these values back into the expression: \[ 0.1 + 12 \]
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Finally, add the two results: \[ 0.1 + 12 = 12.1 \]
The final simplified expression is: \[ \boxed{12.1} \]