Hey there, math enthusiasts and problem – solvers! In a world where calculators are just a click or tap away, we’re throwing down the gauntlet. This challenge is all about relying on your brainpower, not your device. No shortcuts, no easy outs—just pure, unadulterated mental arithmetic!
So, for this task, leave that calculator in your bag, close that app on your phone, and let your mind take the driver’s seat. Whether you’re a seasoned math whiz or just starting to explore the world of numbers, this is your chance to prove what you’re made of. Are you ready to rise to the occasion and show off your mental math skills? Let the challenge begin!
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Answer：
- According to the order of arithmetic operations, calculate the multiplication first：In an arithmetic expression without parentheses, when there is both multiplication and addition/subtraction, multiplication is calculated first. 6×3=18, and the original expression becomes 3−18+6.
- Then calculate the addition and subtraction in sequence：Calculate from left to right. 3−18=−15, −15+6=−9.
So, 3−6×3+6=−9.