(-20/81)×1.25÷（-8/1）=
问题描述：
(-20/81)×1.25÷（-8/1）=
答
(-20/81)×1.25÷（-8/1）
=(-20/81)×(4/5) ×(-8)
=[ (-20/81)×(-2) ] × [(4/5)×4]
=10/81×5
=2/81
=40.5