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討論串[計量] 請教一題計量
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(a + b/c) / (d/e) = ( (ac + b)/c ) / (d/e). = (ace + be) / (cd) ------------(1). Target: doubling a,b,c,d,or e to make (1) halved.. So, either "c" or
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In a certain country, a person is born every 3 seconds and a person dies every10 seconds. Therefore, the birth and death rates account for a populatio
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