表达式3: left parenthesis, "x" minus 2 , right parenthesis squared plus left parenthesis, "y" minus 2 , right parenthesis squared equals 4 left brace, negative 2 less than "x" less than 2 , right brace left brace, 2 greater than "y" less than 4 , right bracex−22+y−22=4−2<x<22>y<4
3
表达式4: left parenthesis, "x" minus 2 , right parenthesis squared plus left parenthesis, "y" plus 2 , right parenthesis squared equals 4 left brace, negative 2 less than "x" less than 2 , right brace left brace, negative 2 less than "y" less than 4 , right bracex−22+y+22=4−2<x<2−2<y<4
4
表达式5: left parenthesis, "x" plus 2 , right parenthesis squared plus left parenthesis, "y" plus 2 , right parenthesis squared equals 4 left brace, negative 2 less than "x" less than 2 , right brace left brace, negative 2 less than "y" less than 4 , right bracex+22+y+22=4−2<x<2−2<y<4
