Question

va rog ma ajutati ???la 2 ,3 si 4

Answer 1

2.
a=puncte concurent 1
a-1=puncte concurent 2
a-1-0,5=a-1,5=puncte concurent 3
a+a-1+a-1,5=35
3a-2,5=35
3a=37,5
a=12,5
a-1=12,5-1=11,5
a-2,5=12,5-1,5=11,5

3.
(√5-2)x>√20-4
(√5-2)x>2√5-4
(√5-2)x>2(√5-2)
x>2

4.
(2x+6)/(x²+4x+3) =2(x+3)/(x²+x+3x+3)=2(x+3)/[x(x+1)+3(x+1)]=
=2(x+3)/(x+1)(x+3)=2/(x+1)