1, Casio fx99 1ESPLUS: It is suitable for most subjects, especially calculus, linear algebra, simultaneous equations and other difficult problems, including ten functional modules such as calculation, complex number, matrix and table.

2. Casio fx99 1CNX: It is suitable for some universities to take the postgraduate entrance examination, with concentrated functions, mainly suitable for basic mathematical calculation and statistical functions, and pays more attention to basic mathematical calculation and statistical functions.