表达式7: "y" equals "a" StartRoot, 3 , EndRoot left brace, negative "a" less than or equal to "x" less than or equal to "a" , right bracey=a3−a≤x≤a
7
表达式8: "y" equals negative StartRoot, 3 , EndRoot left parenthesis, "x" minus 2 "a" , right parenthesis left brace, "a" less than or equal to "x" less than or equal to 2 "a" , right bracey=−3x−2aa≤x≤2a
8
表达式9: "y" plus "a" StartRoot, 3 , EndRoot equals StartRoot, 3 , EndRoot left parenthesis, "x" minus "a" , right parenthesis left brace, "a" less than or equal to "x" less than or equal to 2 "a" , right bracey+a3=3x−aa≤x≤2a
9
表达式10: "y" minus "a" StartRoot, 3 , EndRoot equals StartRoot, 3 , EndRoot left parenthesis, "x" plus "a" , right parenthesis left brace, negative 2 "a" less than or equal to "x" less than or equal to negative "a" , right bracey−a3=3x+a−2a≤x≤−a
10
表达式11: "y" plus "a" StartRoot, 3 , EndRoot equals negative StartRoot, 3 , EndRoot left parenthesis, "x" plus "a" , right parenthesis left brace, negative 2 "a" less than or equal to "x" less than or equal to negative "a" , right bracey+a3=−3x+a−2a≤x≤−a
11
表达式12: "y" equals negative "a" StartRoot, 3 , EndRoot left brace, negative "a" less than or equal to "x" less than or equal to "a" , right bracey=−a3−a≤x≤a
