8+70= 91-90= 4+50= 15-8+4=
50-20= 88-8= 67-60= 75-5+9=
15-716-8 13-510+4 7887 6859
□○□=□ □○□=□
44+6= 32-22= 25+7= 7+8-11= ( )+8=51
25+34= 48+9= 57-20= 5+13+9= 90-( )=50
88-47= 32+36= 25+14= 56-6+7= 24=( )-24
18+9= 85-41= 11+25= 18+7-6= 68=30+( )
14-9= 11-7= 12-8= 9+4-5=
15-9= 7+8= 16-8= 17-9-2=
14-7= 12-3= 17-8= 16+2-7=
5+70= 49-7= 20-5= 84-4=
59-30= 66+9= 38-9= 27-3=
12-5= 34+7= 54-5= 17+6=
21-5+8= 71-40-20= 90-(13+7)=
37+(9-3)= 52+30+7= 56-(10-4)=
=4
=9
=8
16-=+
+-=
所挂重物的质量/Kg
0
1
2
3
4
5
6
7
弹簧的长度/cm
12
12.5
13
13.5
14
14.5
15
15.5
0.4÷0.2= 1÷= 406﹣299= a﹣a×0=