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(2x+7)/(x-4) ≤ 3
[2x+7 - 3(x-4)]/(x-4) ≤ 0 /*(x-4)² , x≠4
(2x+7-3x+12)(x-4)≤0
(19-x)(x-4) ≤ 0
____4_____19_____>
_ _X + + 0 _ _
Odp. x∈(-∞,4) u <19, +∞)
c)
x³/[(x+2)(x+3)²] < 0 /* [(x+2)(x+3)²]² , x≠-2 i x≠-3
x³(x+2)(x+3)² < 0
m.z. x=0, x=-2, x=-3 (podwojny)
_____-3___-2____0_____>x
+ + 0 + + 0 _ _ 0 + +
Odp. x∈(-2, 0)