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最佳答案:(2*0.5x)*(200-10x)=640英语:shin never among 最后一个是什么啊?打错了吧?to 什么 feeling啊?
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最佳答案:一次方程Linear equation 二次方程quadratic equation 三次方程cubic equation
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最佳答案:The article starts from the origin of numbers was discussed,back from birth to i