(-3/40)除以5-3/5除以5

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(-3/40)除以5-3/5除以5

(-3/40)除以5-3/5除以5
(-3/40)除以5-3/5除以5

(-3/40)除以5-3/5除以5
(-3/40)÷5-(3/5)÷5这个式子?(1/5)×(-27/40)=-27/200

原式=(-3/40-3/5)÷5
=(-3/40-24/40)×1/5
=-27/40×1/5
=-27/200

-3/80