(-3)×(-9)×(-5)×(-9分之1)

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(-3)×(-9)×(-5)×(-9分之1)
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(-3)×(-9)×(-5)×(-9分之1)
(-3)×(-9)×(-5)×(-9分之1)

(-3)×(-9)×(-5)×(-9分之1)
(-3)×(-9)×(-5)×(-9分之1)
=(-3)×(-5)×(-9)×(-1/9)
=15×1
=15;
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