12+0+12= \frac{1}{2}+0+\frac{1}{2}= 21+0+21= ?
According to the order of operations, since the exercise only involves addition operations, we will solve the problem from left to right:12+0=12 \frac{1}{2}+0=\frac{1}{2} 21+0=21
12+12=11=1 \frac{1}{2}+\frac{1}{2}=\frac{1}{1}=1 21+21=11=1
1 1 1