Question

va rog este urgent,dau coroana repede!!! ce este uncercuit!! 25 DE PUNCTE SI COROANAAAA!!​

Answer 1

Răspuns:

Explicație pas cu pas:

2,4x+1,(3) =10

2,4x + $\frac{4}{3}$=10

7,2x+4=30

7,2x=30-4

7,2x=26

x=26:7,2

x=3,6(1)

f) 4-2(x+1)=3x+17

4-2x-2 = 3x+17

4-2-17=3x+2x

-15=5x

x=(-15) :5

x= -3

g)2x+3≥1

2x≥1-3

2x≥-2

x≥-1

S={-1}

Answer 2

e) 2,4x+1,(3)=10,x∈Q

24/10x+(13-1)/9=10

12/5x+12/9=10

12x/5+4/3=10

36x/15+20/15=150/15

36x+20=150

36x=150-20

36x=130

x=130/36

x=65/18

f) 4-2(x+1)=3x+17,x∈Z

4-2x-2=3x+17

2-2x=3x+17

-2x-3x=17-2

-5x=15

x=15:(-5)

x= -3

h) 2x+3≥1

2x≥1-3

2x≥ -2

x≥ -2:2

x≥ -1

x∈{-1}

Numarul solutiilor din Z₋ este -1.