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|4 - √5| - |1 - 2√5|= 4 - √5 - (- 1 + 2√5) =
= 4 - √5 + 1 - 2√5 =
= 3 - 3 √5
Zad. 2)
|x|≤5
- 5 ≤ x ≤ 5
x ∈ < - 5, 5>
Odp: x ∈ < - 5, 5 >.
2. x≤5 lub x≤-5
-5≤x≤5
x∈<-5,5>
1.|4-√5|-|1-2√5|=
4+√5-1-2√5=3-√5