Question

Va rog frumos sa ma ajutați e urgent!!ex.12,14,16,18

Answer 1

12)2(caiete) ×3(lei)+5(pixuri)×2(lei)

=6(lei)+10(lei)

=16(lei)

C-caiete

P-pixuri

3c+2p=x(3 deoarece un caiet cista 3lei,2 deoarece un pix costa 2leu,uar x deoarece suma este necunoscuta)

14)x=0=>E(0)=3×0²-5×0+2=2

x=1=>E(1)=3×1²-5×1+2=3-5+2=-2+2=0

x=-2=>E(-2)=3×(-2)²-5×(-2)+2=3×4+10+2=12+12=24

x=3=>E(3)=3×3²-5×3+2=3×9-15+2=27-15+2=12+2=14

x=1/2=>E(1/2)=3×(1/2)²-5×1/2+2=3×1/4-5/2+2=3/4-5/2+2=3/4-10/4+8/4=1/4

x=-2/3=>E(-2/3)=3×(-2/3)²-5×(-2/3)+2=3×4/9+10/3+2=12/9+10/3+2=12/9+30/9+18/9=60/9=20/3

x=rad 3=>E(rad3)=3×(rad3)²-5×rad 3+2=

3×3-5rad3+2=9-5rad3+2=11-5rad3

x=rad2=>E(rad2)=3×(rad2)²-5×rad2+2=3×2-5rad2+2=6-5rad2+2=8-5rad2

16)a)termeni asemenea:7x²,49x²

7x,49x

12,15

*ai si model, cred ca te-ai prins

18)

a)2x-2y

b)x²+x+5

c)-a-2b

d)3x²+2x+7

e)a²-3ax

f)x²-3y²-3xy

g)0

h)5x³