Verified answer

a < b

(a - b) < 0

a/

-11a  ∨ -11b  

-11a + 11b ∨ 0

-11(a-b) ∨ 0

-11 < 0   (a-b) < 0 значит

-11(a-b) > 0

-11a > -11b

b/

9.2b ∨ 9.2a

9.2b - 9.2a ∨ 0

9.2(b - a) ∨ 0

9.2 > 0  (b-a)>0

9.2(b-a) > 0

9.2b > 9,2a

c/

2a ∨ 2b

2(a-b) ∨ 0

2>0  (a-b) < 0

2(a-b) < 0

2a < 2b