11-8=
17-9=
16-7=
3+8-9=
13-5=
13-9=
18-9=
12-5+8=
12-7=
12-8=
17-8=
13-8+6=
16-9=
12-3=
12-9=
4+9-7=
11-7=
16-8=
14-9=
7+7-8=
46+20=
7+38=
63+9=
9+43=
27+7+60=
55+6+30=
(只)
34-9+30= 85-(13+7)=
33-(26-6)= 43-8-30=
69-7= 3+73= 4+56= 65+7= 56-7=
23+60= 57-6= 98-70= 24-6= 49+40=
84-3= 55-30= 16+8= 85-40= 50-7=
50-30= 26+9= 13+80= 80-60= 49-8=
40+2= 38-9= 6+64= 81+3= 20+57=
99-9= 50+40= 39+30= 78-20= 14+5=
15-7= 13-8= 12-4= 15-5=
12-8= 11-7= 18-9= 14-5=
4+6= 12-9= 11-9= 16-9=
19-9= 13-7= 14-7= 17-9=
月份
用电量/千瓦时
电费/元
4
50
25.00
5
80
38.00