-2又3/4(-0.5)²/(-1/2)²(-4/15)-1

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-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*(-0.5)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