1. a+b+c=1
a/0,1 = b/0,4 = c/(1/3) = 1 /(1/10 + 2/5 +1/3) =1/(5/6) = 6/5
a = 3/25 b = 12/25 c = 2/5
2. x/(1/4) = y/(1/3) = z/(1/2) 4x = 3y = 2z y = 4x/3 z = 2x
4x²/3 + 2x² + 8x²/3 = 3·x·4x/3 ·2x
6x² = 8x³ 3 = 4x x = 3/4 y = 1 z = 3/2
3. ab = 3(a+b) +7 10a + b = 3a +3b +7 7a - 2b = 7 (1)
ab = 9(b-a) +1 10a + b = 9b -9a + 1 19a -8b = 1 (2)
din 4·(1) - (2) ⇒ 9a = 27 a = 3 b = 7