表达式10: "y" equals StartRoot, 576 , EndRoot left brace, negative 3 less than or equal to "x" less than or equal to negative 1 , right bracey=576−3≤x≤−1
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表达式11: "x" equals negative 1 left brace, 24 less than or equal to "y" less than or equal to 27 , right bracex=−124≤y≤27
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表达式12: "x" equals negative StartRoot, 9 , EndRoot left brace, 23 less than or equal to "y" less than or equal to 24 , right bracex=−923≤y≤24
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表达式13: .5 equals left parenthesis, "x" minus 0 , right parenthesis squared plus left parenthesis, "y" minus 13 , right parenthesis squared.5=x−02+y−132
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表达式14: .5 equals left parenthesis, "x" minus 0 , right parenthesis squared plus left parenthesis, "y" minus 11.5 , right parenthesis squared.5=x−02+y−11.52
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表达式15: .2 equals left parenthesis, "x" minus 1 , right parenthesis squared plus left parenthesis, "y" minus 21 , right parenthesis squared.2=x−12+y−212
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表达式16: "x" squared plus 18 left brace, negative 1 less than or equal to "x" less than or equal to 1 , right bracex2+18−1≤x≤1
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表达式17: .2 equals left parenthesis, "x" plus 1 , right parenthesis squared positive left parenthesis, "y" negative 21 , right parenthesis squared.2=x+12+y−212
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表达式18: "x" plus 17 left brace, negative 9 less than or equal to "x" less than or equal to negative 5 , right bracex+17−9≤x≤−5
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表达式19: negative "x" plus 17 left brace, 5 less than or equal to "x" less than or equal to 9 , right brace−x+175≤x≤9
