作业帮(-3 1/8)*(-0.125)-0.125*(-4 7/8)
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(-3 1/8)*(-0.125)-0.125*(-4 7/8)
(-3 1/8)*(-0.125)-0.125*(-4 7/8)
(-3 1/8)*(-0.125)-0.125*(-4 7/8)
=0.125*{-(-31/8)-(-47/8)}
=0.125*(31/8+47/8)
=1/8*78/8
=78/64
=39/32