Question

Repede va rog.Dau coroana​

Answer 1

Răspuns:

Explicație pas cu pas:

3a)

1 - (7x - 3)/2 = 2/2 - (7x - 3)/2 = (2 - 7x + 3)/2 = (5 - 7x)/2

-------

2/3 * (5 - 7x)/2 = x

(5 - 7x)/3 = x

5 - 7x = 3x

5 = 7x + 3x

5 = 10x

x = 5/10 = 1/2

___________________

3b)

I2x - 3/2I = 1/2

2x - 3/2 = 1/2

2x = 3/2 + 1/2 = 4/2 = 2

x = 2 : 2 = 1

--------

2x - 3/2 = -1/2

2x = -1/2 + 3/2 = 2/2 = 1

x = 1/2

_______________________

4.

n = numarul problemelor pe care le are de rezolvat

Daca a rezolvat 3/7 inseamna ca mai are de rezolvat 1 - 3/7 = 4/7

n*4/7 = 8

n = 7*8/4 = 14 probleme

________________________

1.

-3/2 = -15/10

-7/5 = -14/10

-15/10 < -14/10

-3/2 < -7/5