The FX-991DE X calculator with its 696 functions and impressive high-resolution LCD display is the most powerful technical-scientific pocket calculator available. Its storage capacity has been quadrupled, allowing users to perform an extensive range of statistical calculations. General information: - 696 functions - Display: Natural V.P.A.M., LCD (Dot Matrix), 63 x 192 dots, 16/10 + 2 digits - Energy supply: Solar powered with back-up battery - With hard case - Size (H x W x D): 11.1 x 165.5 x 77 mm - Weight: 90 g Functions: - High-resolution LCD display with 192 x 63 pixels - Natural display - 696 functions - Icon menu - Spreadsheets - QR code function¹ - Solve equations and systems of equations in the fourth order - 4x4 matrices - Vector analysis - Integral/differential calculations - Calculations with technical units - 164 unit conversions - 47 scientific constants - User interface in German - Solar/battery operation - Distribution functions (normal distribution and inverse normal distribution, binomial distribution, Poisson distribution) - Solve inequalities - Calculation of the minimum and maximum of a function - Improved equation solver - Calculation of the echelon form and reduced echelon form of matrices (Ref/Rref) - Recurring decimal - Integer random numbers - Prime factorisation - Verify function: Verify equality between two expressions - Calculation of products with a finite number of factors - Parts of integers with remainder - Statistical calculation of quartiles - GCD and LCM function - Values table - Repeat function - 24 levels of parentheses - Variable memory (9) - SOTS/RCL key - Trigonometric and inverse trigonometric functions - Hyperbolic and inverse hyperbolic functions - Exponential functions 10x, ex - Inverse function x-1 - Power and root functions xv, v, x2, xy - Logarithmic functions (log, ln) - Combination and permutation calculations - Random number generator - Conversion of polar coordinates into rectangular coordinates and inverse - Fraction calculator (two modes) - Conversion of sexagesimal into decimal and inverse - Calculations in degree, gon and radian - SCI/FIX/ENG function - List-based statistics - Statistics with a variable - Standard deviation - Statistics with two variables (regression functions) - Solve/Calc - Numerical integration - Numerical differentiation - Calculations with complex numbers - Base-n calculations https://elecena.pl/product/18338393/fx991dex-scientific-school-calculator 2021-05-05 https://elecena.pl/product/18338393/fx991dex-scientific-school-calculator 2026-06-27