Question

help me pls ..........​

Answer 1

Răspuns:

1) 4,2x+ 3,4x=19

7,6=19

x=2,5

2)0,5×(2,7+x)=7,25

2,7+x=14,5

x=14,5-2,7

x=11,8

3)2,15x+ 6,14=7,43

2,15x=7,43-6,14

2,15x= 1,29

x=0,6

4) 1,35x-2,42:4=6,28

1,35x-0,605=6, 28

1,35x=6,28+0,605

1,35x=6,885

x=5,1