Question

1.Rezolvati in multimea numerelor rationale pozitive ecuatii:
a) 4x-12=18
b) 31=7x-11
c) x/2+5/6=11/4
d) 4(4x-3)=6x+23

Answer 1

a) 4x-12=18
    4x=18+12
     4x= 30
      x=30:4
       x=7,5
b) 31=7x-11
     31+11=7x
     42=7x
     x=42:7
    x= 6
c) x/2+5/6=11/4
    x/2=11/4-5/6
    x/2=33/12-10/12
    x/2=23/12
    x=23*2/12
    x=3,83
d) 4*(4x-3)=6x+23
    4*(4x-3)=29x
    4*1x=29x
    4x=29x
    x= 29:4
    x= 7,25