Rozwiąż nierówność : A) -3x-7<2 B) 2(x+ 1/4) > 1/2x +4 C) \frac{x-3}{2} < \frac{x+2}{3}
a)
-3x - 7 < 2
-3x < 2 + 7
-3x < 9 /:(-3)
x > -3
odp. x ∈ (-3, +oo)
b)
2(x + 1/4) > 1/2x + 4
2x + 1/2 > 1/2x + 4
2x - 1/2x > 4 - 1/2
1,5x > 3,5
x > 3,5 : 1,5
x > 35/15
x > 7/3
odp. x ∈ (2 i 1/3, +oo)
c)
(x - 3) / 2 < (x + 2) / 3 /*6
3(x - 3) < 2(x + 2)
3x - 9 < 2x + 4
3x - 2x < 4 + 9
x < 13
odp. x ∈ (-oo, 13)
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a)
-3x - 7 < 2
-3x < 2 + 7
-3x < 9 /:(-3)
x > -3
odp. x ∈ (-3, +oo)
b)
2(x + 1/4) > 1/2x + 4
2x + 1/2 > 1/2x + 4
2x - 1/2x > 4 - 1/2
1,5x > 3,5
x > 3,5 : 1,5
x > 35/15
x > 7/3
odp. x ∈ (2 i 1/3, +oo)
c)
(x - 3) / 2 < (x + 2) / 3 /*6
3(x - 3) < 2(x + 2)
3x - 9 < 2x + 4
3x - 2x < 4 + 9
x < 13
odp. x ∈ (-oo, 13)