Reiknireglur – Æfing 1.2 – Lausnir

  1. 2(4 + 325) = 2(4 + 9·5) = 2(4+45) = 2·49 = 98
  2. 7·2 – 3(4·(-2)2 – (6+8/(-2)) – 42) = 14 – 3(4·4 – (6 – 4) – 16) = 14 – 3 (16 – 2 – 16) = 14 – 3(-2) = 14+6 = 20