運算式 15: "x" equals 18.8 left brace, negative 15 less than "y" less than 0 , right bracex=18.8−15<y<0
15
運算式 16: "y" equals negative StartFraction, 1 Over 75 , EndFraction left parenthesis, "x" , right parenthesis squared plus 26.5 left brace, 8 greater than "x" greater than negative 13 , right bracey=−175x2+26.58>x>−13
16
運算式 17: "y" equals StartFraction, 1 Over 40 , EndFraction left parenthesis, "x" plus 18 , right parenthesis squared plus 23.6 left brace, negative 19 less than "x" less than negative 13 , right bracey=140x+182+23.6−19<x<−13
17
運算式 18: "y" equals negative StartFraction, 1 Over 10 , EndFraction left parenthesis, "x" plus 27 , right parenthesis squared plus 30 left brace, negative 16.5 greater than "x" greater than negative 19 , right bracey=−110x+272+30−16.5>x>−19
18
運算式 19: "y" equals negative 1 fifth "x" plus 15.5 left brace, negative 16.5 greater than "x" greater than negative 26 , right bracey=−15x+15.5−16.5>x>−26
19
運算式 20: "x" equals 3 left brace, 26 greater than "y" greater than 24 , right bracex=326>y>24
