(-20/81)×1.25÷(-8/1)=

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(-20/81)×1.25÷(-8/1)=

(-20/81)×1.25÷(-8/1)
=(-20/81)×(4/5) ×(-8)
=[ (-20/81)×(-2) ] × [(4/5)×4]
=10/81×5
=2/81
=40.5