14 - 7 =
15 - 9 =
16 - 8 =
31 - 5 =
20 + 40 =
85 - 5 =
44 + 7 =
93-90=
15-7+3=
8+(90-50)=
47+30+20=
45+3=
30+9=
53+7=
42-5=
67-4=
86-80=
91-5=
28+6=
50+50=
50+5=
70-30＝
48+6＝
42+50＝
35－7＝
18+20＝
54+40＝
33+30＝
56－8＝
52+20＝
65-5＝
78-42= 55+20= 57-50= 66-5= 60+30=
36+23= 6+32= 20+46= 40-9= 98-37=
13-7= 15+9= 30+50= 60-30=
6+44= 67-7= 53-30= 38+40=
