(-4)×(-2.5)×0.1×(-7)×(-5分之3)=

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(-4)×(-2.5)×0.1×(-7)×(-5分之3)=
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(-4)×(-2.5)×0.1×(-7)×(-5分之3)=
(-4)×(-2.5)×0.1×(-7)×(-5分之3)=

(-4)×(-2.5)×0.1×(-7)×(-5分之3)=
(-4)×(-2.5)×0.1×(-7)×(-3/5)
=10*0.1*21/5
=21/5

(-4)×(-2.5)×0.1×(-7)×(-5分之3)
=(4×2.5)×0.1×(7×5分之3)
=10×0.1×5分之21
=1×5分之21
=5分之21

5分之21

=-4x0.1x2.5x7(异号得负)%D%A=-4x2.5x0.1x7(乘法交换律)%D%A=-10x0.1x7%D%A=-7