(1) 缴纳电费:50*0.538+150*0.568+0.638(t-200)
=(0.638t-15.5)元
(2) 没用峰谷电:50*0.538+0.568(a-50)
=(0.568a-1.5)元.
用峰谷电:峰电量为2/5a;谷电量为3/5a
=0.568*0.4*50+0.598*0.4(a-50)+0.288*0.6*50+0.18*0.6(a-50)
∴0.538a-1.5-(0.43a-1.5)=0.138a 元
答:少缴0.138a元
(1) 缴纳电费:50*0.538+150*0.568+0.638(t-200)
=(0.638t-15.5)元
(2) 没用峰谷电:50*0.538+0.568(a-50)
=(0.568a-1.5)元.
用峰谷电:峰电量为2/5a;谷电量为3/5a
=0.568*0.4*50+0.598*0.4(a-50)+0.288*0.6*50+0.18*0.6(a-50)
∴0.538a-1.5-(0.43a-1.5)=0.138a 元
答:少缴0.138a元