20−(1+9:9)= 20-(1+9:9)= 20−(1+9:9)=
First, we solve the exercise in the parentheses
(1+9:9)= (1+9:9)= (1+9:9)=
According to the order of operations, we first divide and then add:
1+1=2 1+1=2 1+1=2
Now we obtain the exercise:
20−2=18 20-2=18 20−2=18
18 18 18