Biểu thức 5: 0 less than "x" left brace, "x" squared minus "y" squared greater than or equal to 1 , right brace left brace, "x" squared plus "y" squared less than or equal to 4 , right brace left brace, 0 less than "y" , right brace0<xx2−y2≥1x2+y2≤40<y
Mở rộng sang 3D
5
Biểu thức 6: "x" Subscript, "m" , Baseline equals 1 half StartRoot, 5 , EndRootxm=125