... D. y )y;x(f)yy;x(f Lim y )y;x(f Lim )y;x(f )y;x( y f x )y;x(f)y;xx(f Lim x )y;x(f Lim )y;x(f )y;x( x f oooo y ooy y oo ' y oo oooo x oox x oo ' x oo ∆ −∆+ = ∆ ∆ = ∂ ∂ ∆ −∆+ = ∆ ∆ = ∂ ∂ →∆→∆ →∆→∆ 00 00 VÝ dô 2: T×m 22 0 0 yx xy Lim y x + → → Kh«ng tån t¹i giíi h¹n trªn • C«ng thøc tÝnh gÇn ®óng: ).(y)y;x(fx)y;x(f)y;x(f )yy;xx(f oo ' yoo ' xoo...
Ngày tải lên: 07/09/2012, 12:45