pPowerPoint Presentationp p-2109 p p sss -a-b-cABCDEFGH-a-bABCDADEH-b-cABGH-a-c = -ABCD+ - ADEH + - ABGH =2ab+bc+ca-a-bABCDF-c 21:16:12 87 5 3 2 25 30 6 10 5 3 p