運算式 26: left parenthesis, StartFraction, "a" Over 2 times "b" , EndFraction , StartFraction, negative .9 5 "c" Over 2 , EndFraction , right parenthesisa2·b,−.95c2
26
運算式 27: left parenthesis, 0 , negative "c" , right parenthesis0,−c
27
運算式 28: left parenthesis, StartFraction, "a" Over "b" , EndFraction , 0 , right parenthesisab,0