수식 17: "b" equals left parenthesis, negative 0.7 , 1.8 , right parenthesisb=−0.7,1.8
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수식 18: "f" left parenthesis, "z" , right parenthesis equals "e" Subscript, "x" "p" , Baseline left parenthesis, "a" , "z" , right parenthesis plus "z" minus "b"fz=expa,z+z−b
