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DAU 60 puncte!!!!!!
Ajutatima va rog!!!!! Ex 4 pag 97 ( clasa 7 )
Amplificati raportul algebric:

b) x+√7 / x-√7 cu x+√7
c) x-y / 3x-y cu 3x+y
d) 4x-y / y+4x cu y+4x


Răspuns :

b) (x+√7)²/ x²-7= x²+14x+7/ x²-7
c) (x-y)(3x+y)/ 9x²-y²= 3x²+ xy- 3xy-y²/ 9x²-y²
d) (4x-y)(y+4x)/ (y+4x)²= 4xy+ 16x²-y²-4xy/ y²+8x+16x²

b).x+¥7/x-¥7ampl cux+¥7=(x+¥7)(x+¥7)/(x+¥7)(x-¥7)<=>(x+¥7)^2/(x^2-¥7^2); c).(x-y)/(3x-y)ampl cu 3x+y=(x-y)(3x+y)/(3x-y)(3x+y)=(x-y)(3x+y)/9x^2-y^2; d).(4x-y)/y+4x)ampl cu y+4x=(4x-y)(4x+y)/(y+4x)(y+4x)=(16x^2-y^2)/(y+4x)^2.