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简答题 GRE

2012-10-13

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D．By the order of operations，you must first square the 3 to get 9—2×9+5，then multiply to get 9-18+5．Contrary to what some teachers mistakenlyinstruct, addition and subtraction are done all at once，from left to right． Thus you first subtract 9-18 to get-9，and then add 5 to get-4．

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