Some provinces and cities allow calculators to be brought into the entrance of the college entrance examination. Casio's calculator is fully functional, but expensive.

At present, Casio calculators suitable for middle school students mainly include fx-ES series and fx-ES PLUS series (fx-MS series before and fx-TL series before), but all of them have been discontinued except fx-ES PLUS series.

(1) Functional descriptions of various types of calculators:

①fx-ES series includes fx-82ES, fx-350ES, fx-95ES and fx-99 1ES calculators.

82ES has the functions of basic calculation, statistics, regression calculation of some function types, and generating function tables according to function expressions.

The 350ES has the same function as the 82ES, but uses a different battery.

Compared with 82ES, 95ES has the function of solving equations (groups) and inequalities (groups).

Compared with 82ES, 99 1ES has more functions such as calculus calculation (only definite integral can be calculated), summation calculation, complex number calculation, matrix and vector calculation, equation solving, logical operation and decimal conversion. Dual pow supply with button cell and solar cell.

②fx-ES PLUS series includes fx-82ES PLUS, fx-350ES PLUS, fx-95ES PLUS and fx-99 1ES PLUS.

Compared with fx-ES series, fx-ES PLUS series has slightly faster operation speed, adding two variables to store, and PLUS series fixes some loopholes in the old series (refer to Baidu fx-ES(MS) Post Bar).

Compared with the corresponding fx-ES series models, fx-ES PLUS series models have added the following functions:

Fx-82ES PLUS: The prime factor decomposition function is added to randomly generate integers within a user-defined range.

Fx-350ES PLUS: same as above.

Fx-95ES PLUS: adding equation solving (EQN mode), naturally writing and displaying inequality results (retaining fractions and irrational numbers), adding ratio calculation (a:b=x:d and a:b=c:x), adding prime factorization and random integer function.

Fx-99 1ES PLUS: The function of writing and displaying the result of solving equation naturally (EQN mode) is added, and the function of random integer is added.

③fx-TL series includes fx-82TL and fx-350TL calculators; The Fx-MS series includes fx-82MS, fx-350MS and FX-991ms.

Its function is roughly the same as fx-ES series calculators, but the calculation results can only be displayed as rational numbers.

(2)

1. between FX-ES series and fx-ES PLUS series, choose fx-ES PLUS series.

2. between FX-82es and fx-350ES (or between fx-82ES PLUS and fx-350ES PLUS), select 82. (350 will be more expensive, its battery is more durable, but 82 batteries can generally last for 2~3 years. )

Between three o'clock. 95 and 99 1, choose 99 1. (99 1 has many more functions than 95, and 95 only has an inequality calculation that 99 1 does not have. )

Between four o'clock. 82 and 99 1, depending on actual needs. (82 is mainly suitable for junior high school, but senior high school is generally enough (especially for liberal arts students), and 99 1 is mainly suitable for senior high school and above. )