-7*(-3)*(-0.5)+(-12)*(-2.6)= 23*(-5)-(-3)/ 128/3=

问题描述:

-7*(-3)*(-0.5)+(-12)*(-2.6)= 23*(-5)-(-3)/ 128/3=

-7*(-3)*(-0.5)+(-12)*(-2.6)
= -21×0.5+31.2
= -10.5+31.2
=20.7
23*(-5)-(-3)/128/3这个是?
= -115+ 1/128
= -114又127/128