-2又3/4*(-0.5)²/(-1/2)²*(-4/15)-1

问题描述:

-2又3/4*(-0.5)²/(-1/2)²*(-4/15)-1

-2又3/4*(-0.5)²/(-1/2)²*(-4/15)-1
=-2又3/4*0.25/(1/4)*(-4/15)-1
=-11/4*(-4/15)-1
=11/15-1
=4/15