4x²≤ 5x
4x²-5x ≤ 0
x(4x-5) ≤ 0
x=0 ∨ 4x-5=0
4x=5
x=1¼
x∈<0;1¼>
(-x+5)(x+2)>0
-x+5=0 ∨ x+2=0
-x=-5 x=-2
x=5
x∈(-2;5)
(1+x)(3-2x)≤0
x=-1 ∨ x=1½
x∈(-∞;01> ∨ <1½;∞)
-4x²-1≤0
-4x²-1=0
-4x²=1
x²=-¼
x∈R
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4x²≤ 5x
4x²-5x ≤ 0
x(4x-5) ≤ 0
x=0 ∨ 4x-5=0
4x=5
x=1¼
x∈<0;1¼>
(-x+5)(x+2)>0
-x+5=0 ∨ x+2=0
-x=-5 x=-2
x=5
x∈(-2;5)
(1+x)(3-2x)≤0
x=-1 ∨ x=1½
x∈(-∞;01> ∨ <1½;∞)
-4x²-1≤0
-4x²-1=0
-4x²=1
x²=-¼
x∈R