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[attach]118120[/attach] Spiegare gentilmente i ragionamenti e argomentare.

andrea_crimi · Accepted Answer

Risolto col metodo di sostituzione [attach]118129[/attach]

gramor · Answer

[attach]118415[/attach] ===========================================================  small  begin {Bmatrix}(x-1)(x-2)-y^2&=&x^2-(y-1)^2 x +y+1&=&0 end {Bmatrix}  small  begin {Bmatrix}x^2-2x-x+2-y^2&=&x^2-(y^2-2y+1) x +y&=&-1 end {Bmatrix}  small  begin {Bmatrix}x^2-3x+2-y^2&=&x^2-y^2+2y-1 x +y&=&-1 end {Bmatrix}  small  begin {Bmatrix} cancel {x^2}-3x cancel {-y^2} cancel {-x^2} cancel {+y^2}-2y&=&-1-2 x +y&=&-1 end {Bmatrix}  small  begin {Bmatrix}-3x-2y&=&-3 y &=&-x-1 end {Bmatrix}  small  begin {Bmatrix}-3x-2(-x-1)&=&-3 y &=&-x-1 end {Bmatrix}  small  begin {Bmatrix}-3x+2x+2&=&-3 y &=&-x-1 end {Bmatrix}  small  begin {Bmatrix}-x&=&-3-2 y &=&-x-1 end {Bmatrix}  small  begin {Bmatrix}-x&=&-5 y &=&-x-1 end {Bmatrix}  small  begin {Bmatrix}x&=&5 y &=&-x-1 end {Bmatrix}  small  begin {Bmatrix}x&=&5 y &=&-5-1 end {Bmatrix}  small  begin {Bmatrix}x&=&5 y &=&-6 end {Bmatrix}

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