Question

Exercițiu 15 punctele a, b, c, d, e​

Answer 1

Răspuns:

a) 2x+2= -7x-21 +9x-15-5     7x+2x- 9x = -21-20-2    0= -43 imp

b) -9x-3 +14 = 21x-9-10      21x+9x  = 14-3+10+9

30x= 24+6     30x= 30   x= 30 :30=1    x=1

c) 14+2*(3-2x+6):2= 37      2*(3-2x+6):2= 37-14 = 23

(6-4x+12):2=23      6+12-4x= 2*23      18-4x=46

4x=18-46     4x=-28     x= (-28):4   = -7    x= -7

d)  -4 -[ 6- (-3-3 -5-x- 7)- 9]= 1  

-4-1 = [ 6- (-3-3 -5-x- 7)- 9]          -5 = [ 6- (-6 -12-x) -]  

6- (-18 -x) -9 = -5     6+18 +x -9= -5      24 +x= 4   x= 4-24  

x= -20