题目内容
为了加强公民的节水意识,合理利用水资源,某市采用价格调控手段达到节水的目的.该市自来水收费价格见价目表,若某户居民1月份用水8m3,则应收水费:2×6+4×(8-6)=20元。
(1)若该户居民2月份用水12.5m3,则应收水费______元;
(2)若该户居民3、4月份共用水15m3(4月份用水量超过3月份),共交水费44元,则该户居民3,4月份各用水多少立方米?
(2)若该户居民3、4月份共用水15m3(4月份用水量超过3月份),共交水费44元,则该户居民3,4月份各用水多少立方米?
解:(1)
元;
(2)当三月份用水不超过
时,设三月份用水
,则

解之得
符合题意
当三月份用水超过
时,但不超过
时,设三月份用水
则
解之得
(舍去)
所以三月份用水
,四月份用水11m3。

(2)当三月份用水不超过



解之得

符合题意
当三月份用水超过



则

解之得

所以三月份用水


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