(-4)×(-2.5)×0.1×(-7)×(-5分之3)=
问题描述：
(-4)×(-2.5)×0.1×(-7)×(-5分之3)=
答
=-4x0.1x2.5x7(异号得负)%D%A=-4x2.5x0.1x7（乘法交换律）%D%A=-10x0.1x7%D%A=-7
答
5分之21
答
(-4)×(-2.5)×0.1×(-7)×(-3/5)
=10*0.1*21/5
=21/5
答
(-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