The electricity used by the water heater was
The electricity used by the water heater was
measured separately and its cost per kilowatt-hour was
one-half the cost per kilowatt-hour of the rest of the
electricity used.The cost of the electricity used by the
water heater was most nearly what fraction of the total
cost of all the electricity used?
measured separately and its cost per kilowatt-hour was
one-half the cost per kilowatt-hour of the rest of the
electricity used.The cost of the electricity used by the
water heater was most nearly what fraction of the total
cost of all the electricity used?
赞 Andy_power 幼苗
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翻译
热水器的用电量是分开测量的.已知热水器每小时的耗电量是其他电器每小时消耗电量的一半,那么热水器的耗电量占所有电器耗电量的百分比是多少?
设热水器每小时耗电x,那么其他电器的耗电量为2x
所求=x/(x+2x)=33%
热水器的用电量是分开测量的.已知热水器每小时的耗电量是其他电器每小时消耗电量的一半,那么热水器的耗电量占所有电器耗电量的百分比是多少?
设热水器每小时耗电x,那么其他电器的耗电量为2x
所求=x/(x+2x)=33%
1年前
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