Question

O valor da expressão é??​

Answer 1

resposta:A)-1

1). 1/×2-1/y2 - 1/y2 y2 - x2/×2y2 (y+x) (y-×)

------------------------- = ----------------------- = ----------------=

1/× + 1/y. y+x/xy. x 2 y2

×y y-x

-----= -----

y+x ×y

2).xy( x+y) ×y

--------------- = ------

(x+y) (x-y) ×-y

y-× xy. (×-y )

------ • ---- = ------ = -1

×y. ×-y. ×-y