Question

Rezolvati in multimea fractiilor zecimile ecuatiilor:
a)8x-4,15+x=4x+15
b)3(x-1,24)+2x=45,12
c)5(x-2,6)+2(x+2,4)=3(x-1,7)
d)8x-15,12=4x-1,432

Answer 1

a)8x-4,15+x=4x+15
9x-4x=15+4,15
5x=19,15
x=19,15/5
x=3,83
x=383/100


b)3(x-1,24)+2x=45,12
3x-3,72+2x=45,12
5x=45,12+3,72
5x=48,84
x=48,84:5
x=9,768
x=9768/1000=1221/125

c)5(x-2,6)+2(x+2,4)=3(x-1,7)
5x-13+2x+4,8=3x-5,1
7x-3x=-5,1+13-4,8
4x=3,1
x=3,1:4
x=0,775
x=775/1000=31/40

d)8x-15,12=4x-1,432
4x=-1,432+15,12
4x=13,688
x=13,688:4
x=3,422
x=3422/1000=1711/500