Neidio i'r prif gynnwys
Enrhifo
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Ffactor
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Rhannu

3+3+1-2-3
Adio 1 a 2 i gael 3.
6+1-2-3
Adio 3 a 3 i gael 6.
7-2-3
Adio 6 a 1 i gael 7.
5-3
Tynnu 2 o 7 i gael 5.
2
Tynnu 3 o 5 i gael 2.