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小數的除法[單位換算] (10點!!!)

Dec 25th 2013, 05:29

蝦仁1公斤320元，買3台斤10兩要多少元?
Sol
3台斤10兩
=(3+10/16)台斤
=(58/16)台斤
=(58/16)台斤*(3/5)公斤/台斤
=(174/80)公斤
320元/公斤*(174/80)公斤
=696元
or
3公斤=5台斤
320元/公斤*(3/5)公斤/台斤
=192元/台斤
192元/台斤*(3台斤10兩)
=192*(3+10/16)元
=(3*192+120)元
=696元

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