Sivu 32: Tehtävä 3. Laske 

1. [[$ {{3 \over 8}+{3 \over 8}+{1 \over 8}} = $]]​


​2. [[$ {{2 \over 9}+{5 \over 9}+{2 \over 9}} = $]]​


3. ​[[$ {{2 \over 10}+{6 \over 10}+{2 \over 10}} = $]]​


4. ​[[$ {{7 \over 8}-{4 \over 8}} = $]]​


5. ​[[$ {{7 \over 8}-{4 \over 8}} = $]]​


6. ​[[$ {1-{2 \over 6}} = $]]​


7. ​[[$ {1-{8 \over 10}} = $]]​