b)
x³+x²=2x(x³+x²)-3x³
x³+x²=2x⁴-x³
-2x⁴+2x³+x²=0
-x²(2x²-2x-1)=0
x²(2x²-2x-1)=0
x²=0 2x²-2x-1=0
x=0 x²-x-1/2=0
x²-x=1/2
x²-x+1/4=3/4=>x-1/2=√3/2 =>x=1/2+√3/2
x-1/2=-√3/2=>x=1/2-√3/2
c)ab(x+2)-3ax
x=-(2b)/(b-3)
asa exercitii merita mai multe puncte
d) 2a(1-a)+a²-2a
2a-2a²+a²-2a
(2a-2a)+(a²-2a²)
-a²+(2a-2a)=>-a²
-a²=0
a²=0
a=0