GRE

简答题

根据要求，回答题：
Formula X is 500，000times as concentrated as formula Y．Formula Y is 80，000 times as concentrated as formula Z．Howmany times as concentrated as formula Z is formula X?

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E．
Formula X is 500，000×80，000 times as concentrated as formulaZ．This is500，000×80，000=40，000，000，000=4×1010．

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