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2012年7月1日起,湖北省正式实施居民生活用电试行阶梯电价.每月用电180 度以下(含180度)电价不变,仍

2023-12-02 16:55热度:4994

(1)180×0.573+(300-180)×(0.573+0.05),
=103.14+120×0.623,
=177.9(元);
答:应交电费177.9元.

(2)设卡帕一家七月份共用电x度,则:
180×0.573+(400-180)×(0.573+0.05)+(x-400)×(0.573+0.3)=327.5,
                                          240.2+(x-400)×0.873=327.5,
                                                           x-400=(327.5-240.2)÷0.873,
                                                           x-400=100,
                                                               x=100+400,
                                                               x=500
答:那么他们一家七月份共用电500度.