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1.(2014-3) : 3 có giá trụ là số tự nhiên lớn nhất
2.71+ 52,5 x 4 = \frac{x+140}{x} + 210
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2.71+ 52,5 x 4 = \frac{x+140}{x} + 210
Thanks nếu bạn giúp mình bài này