równania i nierówności liniowe​

Równania I Nierówności Liniowe class=

Odpowiedź :

Odpowiedź:

a)

3(2 - 3x) = x - 4

6 - 9x = x - 4

- 9x - x = - 4 - 6

- 10x = - 10

10x = 10

x = 10/10 = 1

b)

5x - 7 = 0 * (x + 11) - 2(1 - 3x)

5x - 7 = - 2 + 6x

5x - 6x = - 2 + 7

- x = 5

x = - 5

c)

2(x - 1) + x = x - 3(2- 3x)

2x - 2 + x = x - 6 + 9x

3x - 2 = 8x - 6

3x - 8x = - 6 + 2

- 5x = - 4

5x = 4

x = 4/5

d)

2x + 15 ≥ 6x + 7

2x - 6x ≥ 7 - 15

- 4x ≥ - 8

4x ≤ 8

x ≤ 8/4

x ≤ 2

x ∈ (- ∞ , 2 >

e)

5x+ 2 < 7x + 6

5x - 7x < 6 - 2

- 2x < 4

2x > - 4

x > - 4/2

x > - 2

x ∈ ( - 2 , + ∞ )

f)

x + 1 ≥ 2x + 3

x - 2x ≥ 3 - 1

- x ≥ 2

x ≤ - 2

x ∈ (- ∞ , - 2 >

Odpowiedź:

[tex]a)\\\\3(2-3x)=x-4\\\\6-9x=x-4\\\\-9x-x=-4-6\\\\-10x=-10\ \ /:(-10)\\\\x=1\\\\\\b)\\\\5x-7=0(x+11)-2(1-3x)\\\\5x-7=0-2+6x\\\\5x-7=-2+6x\\\\5x-6x=-2+7\\\\-x=5\ \ /\cdot(-1)\\\\x=-5\\\\\\c)\\\\2(x-1)+x=x-3(2-3x)\\\\2x-2+x=x-6+9x\\\\3x-2=10x-6\\\\3x-10x=-6+2\\\\-7x=-4\ \ /:(-7)\\\\x=\frac{4}{7}[/tex]

[tex]d)\\\\2x+15\geq 6x+7\\\\2x-6x\geq 7-15\\\\-4x\geq -8\ \ /:(-4)\\\\x\leq 2\\\\x\in(-\infty,2\rangle\\\\\\e)\\\\5x+2<7x+6\\\\5x-7x<6-2\\\\-2x<4\ \ /:(-2)\\\\x>-2\\\\x\in(-2,+\infty)\\\\\\f)\\\\x+1\geq 2x+3\\\\x-2x\geq 3-1\\\\-x\geq 2\ \ /\cdot(-1)\\\\x\leq -2\\\\x\in(-\infty,-2\rangle[/tex]