999又997/998÷1/499
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999又997/998÷1/499
999又997/998÷1/499
999又997/998÷1/499
999又997/998÷1/499 = (1000- 1/998)*499= 499000-1/2=498999.5
上面那家伙解出来了,没必要再来一次了:)
原式= 999+997/998*499=999+997/2=999+(1000-3)/2=1499-3/2=1497又1/2
999又997/998÷1/499
=【999+(997/998)】*499
=(1000-1)*499+997/2
=499000-499+(499-1/2)
=499000-1/2
=498999又1/2