-1÷¾×八分之五＝三分之五×三分之四×八分之五＝18分之25
-1(2/3)÷(3/4)×(-5/8)=(-5/3)×(4/3)×(-5/8)=(5/3)×(4/3)×(5/8)=(5/3)×(1/3)×(5/2)=(5×1×5)/(3×3×2)=25/18
