Question

ex:2,3,7,9 si partea a doua toate exercițiile.

Answer 1

2)(2-x)(x-4)=0⇒2-x=0⇒x=2 si x-4=0⇒x=4
⇒x∈{2;4}
3)5+2(x-4)=11
5+2x-8=11
2x=11+8-5
2x=14
x=7
7)4(3-x)+3=3
12-4x+3=3
-4x=-12
x=3
9)2(3-x)+4=4
6-2x+4=4
-2x=-6
x=3