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Rezolvati in Q urmatoarele ecuatii:
a) (x/6 - 1/2) + 2/3 =3
b) -7 |x+3| = 5 |x+3| - 6

Ofer 54p. pt cel mai rapid si mai corect raspuns


Răspuns :

a)(x-3)/6+ 2/3=3
x-3+4=18
x+1=18
x=17
b)-7|x+3|-5|x+3|=-6
12|x+3|=6
|x+3|=1/2
x+3=1/2
x=1/2-3
x=(1-6)/2
x=-5/2
a)termenii din paranteza paranteza aducem la acelasi numitor
(x/6-3/6)+2/3=3
(x-3)/6+4/6=3
(x-3+4)/6=3
x+1=18
x=17
b)ne eliberam de modul
-7(x+3)=5(x+3)-6
-7x-21=5x+15-6
-13x=15-6+21
-12x=30
x=-30/12
x=2.5