(-3分之1)²÷(9分之1)º÷(-5)³÷(-5)²,

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(-3分之1)²÷(9分之1)º÷(-5)³÷(-5)²,

(-3分之1)²÷(9分之1)º÷(-5)³÷(-5)²,
(-3分之1)²÷(9分之1)º÷(-5)³÷(-5)²,

(-3分之1)²÷(9分之1)º÷(-5)³÷(-5)²,
(-3分之1)²÷(9分之1)º÷(-5)³÷(-5)²
=9分之1÷1÷[(-5)³×(-5)²]
=9分之1÷(-5)^5
=9分之1÷(-3125)
=-28125分之1