va rog ajutati-ma nu stiu nimic am luat 4 in teza si trebuie sa imi fac tema.
7,8>b,c,e,f
9>c,e,f
Răspunsuri la întrebare
7 b)
4 (5x + 8) >12
20 x + 32 >12
20x > -32+12
20 x > - 20
x > -20 : 20, x > -1
c) 5(3x +8 ) ≥10
15x +40≥10
15 x ≥10-40
15 x ≥-30
x ≥-30:15, x ≥ -2
e) 5(3-4x)>-25
15 - 20x > - 25
-20 x > -25 -15
-20 x > -40
x > -40 : -20
x > 2
f) 6 ( 7-5x ) < -48
42 - 30 x < -48
-30x < -48-42
-30 x< - 90
x< -90 : -30, x < 3
8 b) 8 x+ 6 ≥5 x - 15
8 x - 5 x ≥-15 - 6
3 x ≥ - 21
x ≥ -21:3, x ≥ - 7
c) 2x - 8 < 7 x + 12
2 x - 7x < 12 + 8
- 5 x < 20
x < 20: -5, x < - 4
e) 17 - 4x > 2 x - 13
- 4x - 2 x > -13 -17
- 6 x > -30
x > -30 : -6, x > 5
f) 50 - 3x ≤ 4 x +15
50 - 15 ≥ 4 x + 3 x
7 x ≤ 35
x ≤ 5
9 c) 5 ( 6 - 3x ) ≤12 - 9x
30 -15 x ≤ 12 - 9x
30 - 12 ≤ 15 x - 9 x
18 ≤ 6 x
x ≥ 18:6, x ≥ 3
e) 24 - 3 x < 6 ( 10 + x)
24 - 3x < 60 + 6 x
- 3 x - 6 x < 60 - 24
- 9 x < 36
x < 36 : -9, x < - 4
f) 75 - 15 x > 8 ( 5 - x)
75 - 15 x > 40 - 8 x
75 - 40 > 15 x - 8 x
35 > 7 x
x > 35 : 7, x > 5