Răspuns:
I.
a) 5-35= - 30
b) 2,31- 5,2= -2, 89
c) 1/2- 19/3= 3/6- 38/6= -35/6
Explicație pas cu pas:
II.a) 2x= 6; x= 3
b) 6x-3-10x-5= 6x+7
-10x-8= 7
-10x= 15
x= - 15/10=- 3/2
d) x²-2x+1+2 ( 4x²+12x+9)=0
x²-2x+1+ 8x²+ 24x+18=0
9x²+22x +19=0 ???
