Margföldun – Æfing 3.1 – Lausnir

  1. 2·4·(-3)·b·a·(-5b) = 60ab2
  2. 5·a·4x·(-2bx)·ab·c·x2 = -40a2b2cx4
  3. a·b·c·x·2a·x2c3·b·(-a)·x4 = -a3b2c4x7
  4. p·q3(-1)·x·y2·p5·x4·5 = -5p6q3x5y2
  5. 7a·(x + a)·(x+b)·ba = 7a2b(x2 + xa + xb + ab) =7a2bx2 + 7a3bx + 7a2b2x + 7a3b2

= 7(a2bx2 + a3bx + a2b2x + a3b2)

  1. a·(-2)3b·(-2)·c·(-3)·d·(-1) = -48abcd
  2. 5x·3b·5q·2b36x·2xb = 1800b5x3q
  3. p100p82·p18 = p100 + 82 + 18 = p200