Răspuns :

Maria5390id

b) x-5/4=7/2

x=5/4+7/2

Amplificam 7/2 cu 2=>

x=5/4+14/4

x=19/4

c)3/5=2x-7/9

2x=7/9+3/5

Amplificam fiecare fractie cu numitorul opus=>

2x=35/45+27/45

2x=62/45=>

x=62/45:2/1

x=62×1/45×2

x=62/90

Simplificam prin 2=>

x=31/45

d) 3x+4/7=11/5

3x=11/5-4/7

Amplificam fiecare fractie cu numitorul opus=>

3x=77/35-20/35

3x=57/35

x=57/35:3/1

x=57×1/35×3

x=57/105

e)5x+1/2=4/3

5x=4/3-1/2

Amplificam fiecare fractie cu numitorul opus=>

5x=8/6-3/6

5x=5/6

x=5/6:5/1

x=5×1/6×5

x=5/30

Simplificam prin 5=>

x=1/6

Răspuns:

Explicație pas cu pas:

(x - 5)/4 = 7/2

2(x - 5) = 4*7

2x - 10 = 28

2x = 28 + 10 = 38

x = 38 : 2 = 19

_____________

3/5 = (2x - 7)/9

9*3 = 5(2x - 7)

27 = 10x - 35

10x = 27 + 35 = 62

x = 62/10 = 31/5 = 6,2

_______________

(3x + 4)/7 = 11/5

5(3x + 4) = 7*11

15x + 20 = 77

15x = 77 - 20 = 57

x = 57/15

________________

(5x + 1)/2 = 4/3

3(5x + 1) = 2*4

15x + 3 = 8

15x = 8 - 3 = 5

x = 5/15 = 1/3

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