40+28-50= 50+14-8= 56-7-20=
24+(26+4)= 45-(38-30)= 30+(26-7)=
13﹣4=
69+1=
51﹣9=
40﹣20﹣20=
5+40=
24+5=
37﹣5=
39﹣(14+6)=
64﹣30=
28+30=
8+24=
45+(10﹣7)=
40+20=
17-9=
56-3=
42+7=
20+30-7=
86-50=
48-8=
31+14=
56-21=
45+5-30=
85-9=
34-7=
56+9=
56+5-20=
34+8=
28-7=
48-6=
9+5-8=
42+30=
78-8=
83-80=
48+(18-9)=
60-50=
70+20=
11-6+7=
73-(13+7)=
99=90+( )
60=66-( )
33=( )+( )
38 - 5 + 20 = 30 + 12 - 7 = 39 +(24 + 6)=
50 + 45 + 5 = 60 +(18 - 8)= 34 -(3 + 6)=
①48+7+20
②66-50-3
③54+(3+17)
④93-(68-50)