Разложите на множители.
1) x^2-y^2-x-y
2) 36-x^2*y^2
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1) x^2-y^2-x-y= (x-y)(x+y) -(x+y)= (x+y)(x-y-1)2) 36-x^2*y^2 = (6 - xy)(6+xy)