已知某市居民生活用电基本价格为每度0.4元,若每月用电量超过a度超过部分按基本电价的120%收费
(1)某户五月份用电84度,共交电费35.52元,求a的值(2)若该户六月份的电费平均每度为0.432元,求六月份公用多少度电,应交多少元
人气:478 ℃ 时间:2020-04-09 18:56:43
解答
(1)a=60
(2)六月份用了100度,应交43.2元
(1)0.4a+(x-a)x0.48=84
(2)0.432x=0.4x60+(x-60)x0.48有过程吗?(1)0.4a+(84-a)x1.2x0.4=350520.4a+0.48x84-0.48a=35.520.48x84-0.08a=35.5240.32-0.08a=35.520.08a=40.32-35.520.08a=4.8a=60(2)0.432x=0.4x60+(x-60)x0.480.432x=24+0.48x-28.8-0.048x=-4.80.048x=4.8x=100100x0.432=43.2
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