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Moduli 7
- 7. I. ]- ∞ ;3[∋x II. [3:+ ∞[∋x
-(x-3)=2 x-3=2
–x+3=2
x=2+3
3-x=2
x=5
x=3-2
x=1
- 9. I. ]- ∞ ;5[∋x II. [5;+ ∞[∋x
5-x=3 -(5-x)=3
x=5-2 -5+x=3
x=3+5
x=3
x=8
- 11. I. ]- ∞ ;3[∋x II. [3;+ ∞[∋x
-(3x-9)=2x+14
3x-9=2x+14
-3x+9=2x+14
9-14=2x+3x 3x – 2x =14 + 9
5x=-5
x = 23
x=-1
- 13. I. ]- ∞ ;2[∋x II. [2;+ ∞[∋x
2x-(6-3x)=9 2x+(6-3x)=9
2x–6+3x=9
2x +6 -3x=9
5x=9+6
-x = 3
5x=15 x = -3 ø
x=3 ø
- 15. 3.I2x+6I=2-x Хариу: -8;-4/3
4.5- I12-3xI=-5 Хариу: 22/3;2/3