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1CARE DIN ECUATIILE DE MAI JOS ADMITE SOLUTIA X=3
A) 3X+1=X+5
B)2X=X+3
C)24:X=6
D) 2la putere x =8

2 Rezolvati in IN:
A) 3X+1
B) [(X+1) x 2-1 ] x 3-1≤ 32


Răspuns :

1)a) 3x+1=x+5  ; 3x-x=5-1 ; 2x=4 ; x=4:2 ; x = 2 (nu admite)
b) 2x= x+3  ; 2x-x=3 ; x=3 (admite)
c)24:x=6  ; x= 24:6 ; x=4 (nu admite )
d) 2 la puterea x =8 ;  x= 3 ( admite )