13+23+234= \frac{1}{3}+\frac{2}{3}+2\frac{3}{4}= 31+32+243=
According to the rules of the order of operations in arithmetic, we solve the exercise from left to right.
Let's note that:
13+23=33=1 \frac{1}{3}+\frac{2}{3}=\frac{3}{3}=1 31+32=33=1
We should obtain the following exercise:
1+234=334 1+2\frac{3}{4}=3\frac{3}{4} 1+243=343
334 3\frac{3}{4} 343