Question

1) complete as igualdades com a parcela que falta.

6+5+ =20
12+ + 10=30
20+ + 10 = 30
+ 50+ 20= 80
12+ + 20 = 40
6+12+ =30

Answer 1

6+5+9
8+12+10
0+20+10
10+50+20
8+12+20
12+6+12

Answer 2

6+5+(9)=20
12+(8)+10=30
(10)+50+20=80
12+(8)+20=40
6+12+(12)=30