(8:4:2)−3−1= (8:4:2)-3-1= (8:4:2)−3−1=
According to the rules of the order of operations, we first solve the exercise within parentheses from left to right:
8:4=2 8:4=2 8:4=2
2:2=1 2:2=1 2:2=1
Now we get the exercise:
1−3−1= 1-3-1= 1−3−1=
We solve the exercise from left to right:
1−3=−2 1-3=-2 1−3=−2
−2−1=−3 -2-1=-3 −2−1=−3
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