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9b_Talnafræði
Contributed by: Sverrisson
(Original author: Shepherd)
__1. (1+2) + 3 = 1 + (2 + 3)A. Samlagningarhlutleysa
__2. 3(4) = 4(3)B. Margföldunarhlutleysa
__3. 5(1/5) = 1C. Víxlregla í samlagningu
__4. 5*0 = 0D. Dreifiregla
__5. 7(x + 12) = 7x + 84E. Tengiregla
__6. 16 + 0 = 16F. Samlagningarandhverfa
__7. 19 + (-19) = 0G. Margföldunarandhverfa
__8. a(b*c) = (a*b)cH. Víxlregla í margföldun
__9. a*1 = aI. Tengiregla í margföldun
__10. a + b = b + aJ. Margföldun með tölunni núll
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