Răspunsuri

2014-04-15T21:02:00+03:00
Ajutatima si pe mine va implor
1)DVA  7x/x^2-25
2)x²-2/3x+1          a)x=2    b)x=√3

3)Simplificare 
a)x^2+36/x^2+12x+36
b)x^2-16/x^2-8x+16

2014-04-15T21:05:12+03:00
A) (x²-y²)/xy=(1-√3)²-(1+√3)²/(1-√3)(1+√3)
=(1-2√3+3-1+2√3-3)/1-3
=-1/2
b)(x+y)/(x²+y²)=(√2-1+√2+1)/(√2-1)²+(√2+1)²
=2√2/(2-2√2+1+2+2√2+1)=
=2√2/6simplificam=√2/3
2014-04-15T21:05:16+03:00
A) (x²-y²)/xy=(1-√3)²-(1+√3)²/(1-√3)(1+√3)
=(1-2√3+3-1+2√3-3)/1-3
=-1/2
b)(x+y)/(x²+y²)=(√2-1+√2+1)/(√2-1)²+(√2+1)²
=2√2/(2-2√2+1+2+2√2+1)=
=2√2/6simplificam=√2/3