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奶多，还是水多

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Submitted by admin on Wed, 10/05/2016 - 09:07
Milk

大卫（David）喝了一杯牛奶的1/6，然后加满水，又喝了一杯的1/3，再倒满水后又喝了半杯，又加满了水，最后把一杯都喝了，那么大卫喝的牛奶多，还是水多？

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上期答案：



202– 192 + 182 – 172 + 162 – 152 + … + 22 – 1 = 210

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