Question

vă rog din suflet dau coroana!!!​

Answer 1

Răspuns:

Explicație pas cu pas:

a)

2x/5 - 3/10 = 1/2

2x/5 = 1/2 + 3/10 = 5/10 + 3/10 = 8/10 = 4/5

2x/5 = 4/5

x = 4/5 : 2/5 = 4/5*5/2 = 2

b)

3x/4 - 7/9 = 13/18

3x/4 = 13/18 + 7/9 = 13/18 + 14/18 = 27/18 = 3/2

3x/4 = 3/2

x = 3/2 : 3/4 = 3/2*4/3 = 2

c)

5x/7 - 9/4 = 11/14

5x/7 = 11/14 + 9/4 = 22/28 + 63/28 = 85/28

5x/7 = 85/28

x = 85/28 : 5/7 = 85/28*7/5 = 17/4

d)

x/2 + 1/40 = 3x/5

3x/5 - x/2 = 1/40

6x/10 - 5x/10 = 1/40

x/10 = 1/40

x = 10*1/40 = 1/4

e)

x/5 - 1/9 = 4x/15

4x/15 - x/5 = -1/9

4x/15 - 3x/15 = -1/9

x/15 = -1/9

x = -15/9 = -5/3

f) iti ramane tie