10b - Ferningsrót - Hugarreikningur
__1. Ferningsrótin af 4 x 7 x 7 x 4A. 36
__2. Ferningsrótin af 4 x 9 x 4 x 9B. 5/6
__3. Ferningsrótin af 44C. 9/10
__4. Ferningsrótin af 54D. 1000
__5. Ferningsrótin af 108E. 104
__6. Ferningsrótin af 25/36F. 16
__7. Ferningsrótin af 81/100G. x6
__8. Ferningsrótin af 1000000H. 25
__9. Ferningsrótin af x10I. 28
__10. Ferningsrótin af x12J. x5
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