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原式=(-1/3)²;÷(-1/3)³;×(1/3)³;÷(3^-2)×(-3) =1/9÷(-1/27)×1/27÷1/3²;×(-3) =1/9×(-27)×1/27÷1/9×(-3) =-3×1/27×9×(-3) =-1/9×9×(-3) =-1×(-3) =3
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