(-8/9)×(-0.25)×(-1/4)×9=?(1又3/4-0.875-7/12)×(-1又1/7)=?(-5)×(-7/9)×(-0.8)×(2又1/4)×(-1/7)=?

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(-8/9)×(-0.25)×(-1/4)×9=?(1又3/4-0.875-7/12)×(-1又1/7)=?(-5)×(-7/9)×(-0.8)×(2又1/4)×(-1/7)=?(-8/9)×(-0.

(-8/9)×(-0.25)×(-1/4)×9=?(1又3/4-0.875-7/12)×(-1又1/7)=?(-5)×(-7/9)×(-0.8)×(2又1/4)×(-1/7)=?
(-8/9)×(-0.25)×(-1/4)×9=?(1又3/4-0.875-7/12)×(-1又1/7)=?
(-5)×(-7/9)×(-0.8)×(2又1/4)×(-1/7)=?

(-8/9)×(-0.25)×(-1/4)×9=?(1又3/4-0.875-7/12)×(-1又1/7)=?(-5)×(-7/9)×(-0.8)×(2又1/4)×(-1/7)=?
(-8/9)×(-0.25)×(-1/4)×9
=(-8/9)*9*(-0.25)*(-1/4)
=(-1)*1
=-1
(1又3/4-0.875-7/12)×(-1又1/7)
=(7/4-7/8-7/12)*(-8/7)
打开=(-2)+1+3/4
=-1/4
(-5)×(-7/9)×(-0.8)×(2又1/4)×(-1/7)
=[(-5)*(-0.8)]*[(-7/9)*(-1/7)]*(9/4)
=4*(1/9)*(9/4)
=1