rozwiaz:
a:
b:
a)
b)
2x/(x+1)≤(3x+2)/(x+4) x≠-1,x≠-4
2x/(x+1)-(3x+2)/(x+4)≤0
2x(x+4)/(x+1)(x+4)-(3x+2)(x+1)/(x+1)(x+4)≤0
(2x²+8x)/(x+1)(x+4)-(3x²+3x+2x+2)/(x+1)(x+4)≤0
((2x²+8x)-(3x²+3x+2x+2))/(x+1)(x+4)≤0
(2x²+8x-3x²-3x-2x-2)/(x+1)(x+4)≤0
(-x²+3x-2)/(x+1)(x+4)≤0
(-x²+x+2x-2)/(x+1)(x+4)≤0
(-x(x-1)+2(x-1))/(x+1)(x+4)≤0
-(x-2)(x-1)/(x+1)(x+4)≤0 |*(x+1)²(x+4)²
-(x-2)(x-1)(x+1)(x+4)≤0
x=2 ∨ x=1 ∨ x=-1 ∨ x=-4
Rysuję przybliżony wykres (załącznik)
x∈(-∞,-4)u(-1,1>u<2,∞)
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a)
b)
2x/(x+1)≤(3x+2)/(x+4) x≠-1,x≠-4
2x/(x+1)-(3x+2)/(x+4)≤0
2x(x+4)/(x+1)(x+4)-(3x+2)(x+1)/(x+1)(x+4)≤0
(2x²+8x)/(x+1)(x+4)-(3x²+3x+2x+2)/(x+1)(x+4)≤0
((2x²+8x)-(3x²+3x+2x+2))/(x+1)(x+4)≤0
(2x²+8x-3x²-3x-2x-2)/(x+1)(x+4)≤0
(-x²+3x-2)/(x+1)(x+4)≤0
(-x²+x+2x-2)/(x+1)(x+4)≤0
(-x(x-1)+2(x-1))/(x+1)(x+4)≤0
-(x-2)(x-1)/(x+1)(x+4)≤0 |*(x+1)²(x+4)²
-(x-2)(x-1)(x+1)(x+4)≤0
x=2 ∨ x=1 ∨ x=-1 ∨ x=-4
Rysuję przybliżony wykres (załącznik)
x∈(-∞,-4)u(-1,1>u<2,∞)