50/(5/6)/(6/7)/(7/8)/(8/9) ／是除号 急

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50/(5/6)/(6/7)/(7/8)/(8/9) ／是除号 急
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50/(5/6)/(6/7)/(7/8)/(8/9) ／是除号 急
50/(5/6)/(6/7)/(7/8)/(8/9) ／是除号 急

50/(5/6)/(6/7)/(7/8)/(8/9) ／是除号 急
50/(5/6)/(6/7)/(7/8)/(8/9)
=50×6/5×7/6×8/7×9/8
=50×（6/5×7/6×8/7×9/8）
=50×9/5
=90

先算分母(5/6)/(6/7)/(7/8)/(8/9)=5/9(约分）
再算50除5/9=50×9/5=90

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