计算：12-18-0.5+13-数学

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• 计算：3+12-318+72．-数学
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• 计算：27-12+45=______．-数学
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• 32-8+12．-数学
• 计算：12-13-113．-数学
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• 计算：36-(-3)2．-数学
• By the time he realizes he _____ a mistake, it’ll be too late for him to change his mind.A．makesB．ma
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• （1）计算：275-327+12；（2）计算：2sin60°-cot30°+tan45°．（3）解方程：x2-6x+1=0．-数学
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• 解答下列各题：（1）计算：（48+20）-（12-5）；（2）解方程：x2-2x-4=0；（3）解方程：3（x-5）2=2（5-x）；（4）计算：3tan230°+2(sin45°-1)2．-数学
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• 计算：(24+0.5)-(18-6)．-数学
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• 计算：12-513+0.27+13．-数学
• 计算：3-32+218-1227+18．-数学
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• 下列等式成立的是（）A．a+b=a+bB．53x-43x=6xC．2x27x-6x3x4=3x3xD．3mx-5x=3m-5x-数学
• 15+603-35；17-28+700．-数学
• 化简：20-5=______．-数学
• ----I have got a headache. ---- No wonder. You ________ in front of that computer too long.A．workB．a
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