表达式6: "y" equals 0 left brace, 1 less than or equal to "x" less than or equal to 4 , right bracey=01≤x≤4
6
表达式7: "y" equals 6 left brace, 1 less than or equal to "x" less than or equal to 4 , right bracey=61≤x≤4
7
表达式8: "x" equals 6 left brace, negative 6 less than or equal to "y" less than or equal to 6 , right bracex=6−6≤y≤6
8
表达式9: "y" equals negative 6 left brace, 6 less than or equal to "x" less than or equal to 9 , right bracey=−66≤x≤9
9
表达式10: "x" equals 11 left brace, negative 6 less than or equal to "y" less than or equal to 6 , right bracex=11−6≤y≤6
10
表达式11: "y" equals negative 6 left brace, 11 less than or equal to "x" less than or equal to 14 , right bracey=−611≤x≤14
11
表达式12: left parenthesis, "x" minus 21 , right parenthesis squared plus left parenthesis, 5 sixths "y" , right parenthesis squared equals 5 squaredx−212+56y2=52
