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解:原式$=(-81) × \dfrac{4}{9} × \dfrac{4}{9} ÷ (-16)$
$= (-81) × \dfrac{4}{9} × \dfrac{4}{9} × (-\dfrac{1}{16})$
$= -16 × (-\dfrac{1}{16})$
$=1$
解:原式$=-1 + 4 + (-3) - (6×\dfrac{1}{2} - 6×\dfrac{1}{3})$
$=-1 + 4 - 3 - (3-2)$
$=0 -1$
$=-1$