Discussion
The following equation is incorrect. Which two signs should be interchanged to correct the equation?
10 x 4 + 5 - 30 ÷ 6 = 31
Answer: A
Correct answer: x and -
Exchanging × and − gives \( 10 - 4 + 5 \times 30 \div 6 \), which works out as \[ 10 - 4 + 25 = \mathbf{31} \]
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