拖式:4/5*(-25/3)*(-7/10)= (7/12-5/6+1)*(-24)= [1/5+(-1/2)+(-5/12)]*(+60)= -99又17/18*9=

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拖式:4/5*(-25/3)*(-7/10)= (7/12-5/6+1)*(-24)= [1/5+(-1/2)+(-5/12)]*(+60)= -99又17/18*9=
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拖式:4/5*(-25/3)*(-7/10)= (7/12-5/6+1)*(-24)= [1/5+(-1/2)+(-5/12)]*(+60)= -99又17/18*9=
拖式:4/5*(-25/3)*(-7/10)= (7/12-5/6+1)*(-24)= [1/5+(-1/2)+(-5/12)]*(+60)= -99又17/18*9=

拖式:4/5*(-25/3)*(-7/10)= (7/12-5/6+1)*(-24)= [1/5+(-1/2)+(-5/12)]*(+60)= -99又17/18*9=
4/5*(-25/3)*(-7/10)=(-20/3)×(-7/10)=12/3
(7/12-5/6+1)*(-24)=(19/12-10/12)×(-24)=9/12×(-24)=-18
[1/5+(-1/2)+(-5/12)]*(+60)=12-30-25=12-55=-43
-99又17/18*9=(-99-17/18)×9=-99×(10-1)-17/2=-990+9-17/2
=-881-8又1/2=-889又1/2