+ = + = - = 0.5+ =
1- = 1- - = + + = + - + =
12÷13=
82=
0.23=
15.3÷0.3=
1.2+0.8÷0.4=
+ = - = + = 1- =
- = +2= -0= -1=
x-= x+=1-
23=
+0.3=
+4=
4.1-3.8= 4+0.78= 14.6-0.4= 1.3+8.6= 0.8-0.55=
4-0.04= 1-0.03= 3.5+3.5= 0.8-0.5= 0.78+2.2=
6×= = = 14÷=
0÷= ×6= 1÷= =
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月份
4月
5月
用电量/千瓦时
80
75