Discussion
If ‘+’ means ‘÷’, ‘-‘ means ‘×’, ‘×’ means ‘+‘, ‘÷’ means ‘- ‘, given the value of 45 + 9 - 3 × 15 ÷ 2.
Answer: D
Correct answer: 28
Substituting gives \[ 45 \div 9 \times 3 + 15 - 2. \] Division and multiplication first, left to right: \( 45\div9 = 5 \), \( 5\times3 = 15 \). Then \( 15 + 15 - 2 = 28 \).
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