Question

Rezolvați ecuatiile
A)3x-14=0
B)6(x+3)=2x-15
C)7x+6x=39
D)x(9+25)=-3la puterea2 -5la puterea2
E)5x-7=3 x apartine multimii{-2,0,2,5}
F)4x-13=0 x apartine multimii{-13/4,0,4/13,2}
G)x+3/5x=2,3+1/3

Answer 1

A) 3x-14= 0
3x= 0+14
3x= 14
x= 14/3

B) 6(x+3)= 2x-15
6x+18= 2x-15
6x-2x= -15-18
4x= -33
x= -33/4

C) 7x+6x= 39
13x= 39
x= 39:13
x= 3

D) 9x+25x= 9-25
34x= 9-25
34x= -16
x= -16/34
x= -8/17

E) 5x-7= 3
5x= 3+7
5x= 10
x= 10:5
x= 2, x€{-2, 0, 2, 5} (A)

F) 4x-13= 0
4x= 13
x= 13/4, x€{-13/4, 0, 4/13, 2} (F)=> x€∅

G) (aici nu înțeleg dacă ai vrut să scrii 3/5 •x sau 3 supra 5x (5x, jos la numitor...)