As an engineering student, scientific computing has become one of the daily necessary tasks. For tedious mathematical computing, the importance of scientific calculators is self -evident. Accurate.

The original intention of buying this calculator is to cope with the calculation of the matrix, such as the multiplication of the calculation matrix, the ranks of the matrix, and the inverse of the matrix. The matrix execution calculation is composed.

If you want to be familiar with the use of scientific calculators, detailed user manuals are essential. The instruction manual of this calculator has a total of 72 pages, introducing the use of the calculator and the top ten

Features.

Casio FX-991CN scientific calculator body is paired with white color tone on the back, simple and stylish, weighing about 200g of quality, small and portable.

Casio FX-991CN scientific calculator body surface is processed with special processes, plastic keys are comfortable, and the metal texture experience. The color of white, black, and blue keys is matched with beautiful and stylish design on the front.

Using a sliding hard cover design can effectively protect the calculator button, and it can also be easily slid. The design is not exquisite.

This Casio FX-991CN scientific calculator uses dual battery power, and the dual guarantee of solar cells and button batteries. When the solar cell power is powered, the lamp at the top right of the screen will be displayed. When the battery battery is insufficient, you can remove the battery cover on the back of the fuselage and replace the corresponding battery.

Casio FX-991CN scientific calculator can provide 40 unit conversion and 47 scientific constant. The text on the button represents its default function. The text above represents other functions of the keys. Can be activated, the purple text function needs to be pressed with the [Alpha] button to activate.

Compared with the previous generation calculators, the screen resolution of this calculator has significantly improved, and the black and white LCD display can provide clearer display effects.

This Casio FX-991CN scientific calculator can provide computing, complex, base, matrix, vector, statistics, form, equations/functions, universal formulas, and ten computing modes. Through the corresponding calculation mode, enter the corresponding mode calculation.

The computing mode can perform basic mathematical operations, including the addition and subtraction, multiplication, and other operations. The calculation results can be switched, the memory function, the input expression and value, and the input and output format are specified.

The plural mode can use right -angle coordinates or polar coordinates to input plurals, solve the plural multiple of the plural, extract the real and virtual parts of the plural number, and calculate the absolute value and spoke angle of the plurality.

Base modes can be calculated by decimal (DEC), hexadecimal (HEX), octagonal (OCT), and binary (BIN).

The matrix mode can be calculated for the matrix of up to 4 lines and 4 columns, such as the calculation of the multiplication of the matrix, the ranks of the matrix, and the inverse of the matrix.

The vector mode can perform a two -dimensional and three -dimensional vector calculation, which can perform operations such as internal accumulation, fork accumulation, absolute value, multiplication, unitization and other operations of the vector.

Statistical models can perform single variable statistical calculations, dual -variable linear regression calculations, dual variable secondary regression calculations, dual variable pairing calculation calculations, dual variable E index regression calculation, dual variable AB index regression calculation, dual variable multiplication calculation calculation and calculation Dual variables return calculation calculations.

Table mode can generate a number table on the basis of one or two functions, and can use function f (x) or two function f (x) and g (x).

The equation/function mode can solve the primary, secondary equations, three -time equations, and four -time equations of dual -to four yuan.

Unlimited models can be solved in secondary, three or four inconsistency.

The proportional mode can determine the proportional representation A: B = x: d or a: b = c: x value of x (known A, B, C, D value).

The calculator itself can be set, including input/output, angle unit, display format, engineering symbol, score result, plural, statistics, equations/functions, tables, decimal points, digital segmentation, multi -line fonts, language and contrast.

In general, this Casio FX-991CN scientific calculator can provide computing, plural, base, matrix, vector, statistics, forms, equations/functions, universal formulas, proportions, and ten types of computing modes. It has high-definition display effects and comfortable. The key touch, the dual battery is given the dual guarantee of the calculator, which can be described as the best choice of the scientific function calculator.

Author: Promise in the sun