1) (2x+1)(x-2)-2(x²-x-1)
2)4√12a-5√27a+3√48a-3√3a
3)x √ lung din(3-2√3)²+2x √ lung din(√3-2)²
4)x √ lung din(1-√2)²+x √ lung din(4-3√2)²-x √ lung din(7-5√2)²-|2-3|x
4.Daca 3x+5y=16 si 5x+3y=24,atunci 7x-7y = ?

1

Răspunsuri

Cel mai inteligent răspuns!
2014-02-28T16:21:21+02:00
1) (2x+1)(x-2)-2(x²-x-1)= =2x²+4x+x+2-[(2x)²-2x-2]= =2x²+5x+2-4x²+2x+2= =-2x²+7x+4
2)4√12a-5√27a+3√48a-3√3a=
=8√3a-15√3a+12√3a-3√3a=
=-7√3a+9√3a=
2√3a
multumesc!
cu placere.
:)