1)

а) (х-1,2)*(х+4)≤0

х ∈ [-4; 6/5]

b) (2+x)(x+10)(3-x)>0
x ∈ (-∞,-10) ∪ (-2,3)

B) x ∈ (-∞;-3/2]∪[-1,4;1/2]∪[7/4;+∞]

2)

a)

1)

x-4>0     ...  x-4<0    

x+5>0    ...  x+5<0  

2)

x>4    ...  x<4

x>-5   ...  x<-5

x∈(4;+∞)

x∈(-∞;-5)

b)

x-1,5/x+2,5≤0; x≠ -2,5

x-3/2 / x+5/2 ≤ 0

2x-3/2 / 2x+5/2 ≤0

2x-3/2x+5≤0

...

х ∈ (-5/2;3/2]