表达式11: "n" equals negative left parenthesis, StartFraction, 1 Over 40 , EndFraction "x" left brace, negative 26 less than "x" less than negative 4.4 , right brace , right parenthesis minus 21.5n=−140x−26<x<−4.4−21.5
11
表达式12: "n" equals negative left parenthesis, StartFraction, 1 Over 40 , EndFraction "x" left brace, negative 2.3 less than "x" less than negative 1.5 , right brace , right parenthesis minus 21.5n=−140x−2.3<x<−1.5−21.5
12
表达式13: "n" equals negative left parenthesis, StartFraction, 1 Over 100 , EndFraction "x" left brace, .5 less than "x" less than 4 , right brace , right parenthesis minus 21.5n=−1100x.5<x<4−21.5
