做一做，结果能约分的要约分，是假分数的要化成带分数．=========
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2.009×43+20.09×2.9+200.9×0.28
（2.5×）÷（×1.8）-0.75÷
20142014×20142013-20142015×20142012
1375+450÷18×25
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）÷（
×1.8）-0.75÷
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