Question

Ex 1
Va rog! E urgent!

Answer 1

Răspuns:

Explicație pas cu pas:

a) 14x=12(x+1)

14x=12x+12

14x-12x=12

2x=12

x=12/2=6

b) 9x=7(x+2)

9x=7x+14

9x-7x=14

2x=14

x=14/2=7

c) 18x=16(x+1)

18x=16x+16

18x-16x=16

2x=16

x=16/2=8

d) 28x=7×15

28x=105

x=105/28

e) 2(x+1)=20

2x+2=20

2x=20-2

2x=18

x=18/2=9

f) 5×3x=21×27

15x=567  I :3

5x=189

x=189/5

g) identic cu d)

h) identic cu e)

i) identic cu f)