1. 5/13*1/3+4/39=5/39+4/39=9/39=3/13;
2. 35/33+2/11*1/3=35/33+2/33=37/33=1 4/33;
3. 46/23*1/2=46/46=1;
4. 5/5=1.
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Answers & Comments
1. 5/13*1/3+4/39=5/39+4/39=9/39=3/13;
2. 35/33+2/11*1/3=35/33+2/33=37/33=1 4/33;
3. 46/23*1/2=46/46=1;
4. 5/5=1.