Răspunsuri

2014-11-14T00:00:38+02:00
Eplicitam modulul
x                     -2                   1/3
x+2   - - - - - - - -0+++++++++++++++++++++++++++
3x-1 - -- - - - - - - - - - - - - - - - - -0++++++++++++++++++
a)x∈(-α,-2)
-x-2=-3x+1
-1+3x=1+2
2x=4
x=4/2=2 nu e sol
b)x∈(-2,1/3)
x+2=-3x+1
x-3x=1-2
-2x=-1   (-1)
x=1/2   nu e sol pt ca ∉(-2,1/3)
c)x∈(1/3,+α)
x+2=3x-1
x-3x=-1-2
-2x=-3           (-1)
x=3/2 este sol 
2014-11-14T00:16:23+02:00
|x+2|=|3x-1| x+2=3-1 x-3x=-1-2 -2x=-4 \ *(-1) 2x=4 x=4:2 x=2 *= ori