A + B =
A - B =
A X B =
A * B =
A : B =
AA + B =
AA - B =
AA X B =
AA + BB =
AA - BB =
AAA + B =
A + B + C =
AA + B - c =
A + B * C =
A * B * C =
A ( B + C ) =
A ( B - C ) =
