991ES scientific computing tablet

991ES scientific computing tablet is a professional intelligent device integrating high-order scientific computing and digital handwriting recording. It inherits the innovative design of classic 991ES computing kernel, adopts folding portable structure and high-precision induction technology, and adapts to the deep learning and work needs of junior high school, college students, scientific research and engineering personnel, and realizes the integrated solution of "complex operation-process deduction-accurate recording".

First, the core scientific computing function
The equipment has built-in classic 991ES full-function scientific computing module, equipped with 417 kinds of operation functions, covering the whole scene requirements from basic arithmetic to higher-order mathematical operation. It is designed by algebraic notation (VPAM), and its operation accuracy and stability have been verified by the market for a long time. It is recognized as a weapon for higher-order calculation in the field of education (the name of "991ES" comes from its classic operation core and upgraded iteration attribute).

Eight core operation modes: covering eight modes: basic arithmetic, scientific calculation, statistical regression, matrix operation, vector operation, complex number calculation, equation solving, integral and differential, which can realize basic functions such as trigonometric function, hyperbolic function, exponential logarithm, permutation and combination, factorial, random number generation, etc. At the same time, it supports the rapid call of common constants such as pi and natural constant E, which is suitable for the complex calculation requirements of middle school competitions, university specialized courses and scientific research scenes.

Natural writing display and precise operation: it is equipped with a four-line lattice LCD high-definition display screen, which supports the natural display of printed mathematical symbols and formulas, presents the operation process and results synchronously, completely fits the classroom writing habits and avoids the omission of operation steps; The buttons are made of high-sensitivity and wear-resistant materials, and the logical key layout fits the classic design of 991ES, and the common functions are directly reached by one key, taking into account the operating feel and service life.

Upgrade of high-order operation ability: enhance the performance of matrix and vector operation, support the maximum 4×4 matrix calculation and vector dot product/cross product operation, and realize the functions of logarithm exchange, multivariable equation solving, definite integral/indefinite integral operation, derivative and limit operation, and statistical analysis (average, median, standard deviation, regression analysis), etc., and meet the needs of mathematics, physics, chemistry, engineering and other disciplines without the assistance of additional tools.

Storage and backtracking function: Built-in memory storage unit can save intermediate calculation results, support multi-step backtracking review, facilitate modification and reuse of complex operation processes, and improve calculation efficiency and accuracy.

Second, the digital handwriting creation function
Integrated 7-inch LCD handwriting board, using pressure sensing technology, giving consideration to writing fluency and erasing convenience, realizing paperless recording and creative expression, and seamlessly connecting with computing functions.

Accurate handwriting sensing: it supports special electronic pen writing and has pressure sensing function, which can adjust the line thickness according to the writing strength and restore the writing texture of paper and pen; The writing life can reach 100,000 times, which is wear-resistant and durable. It is matched with 5 spare pen heads to meet the long-term use requirements.

Convenient editing operation: equipped with a one-button erase button, it can quickly erase handwritten content, and support switching between partial erasure and full page erasure; Add the lock button to prevent the important notes from being erased by mistake, and ensure the recording safety.

Multi-scene creation adaptation: it can be used for scenarios such as calculation process deduction, formula draft drawing, mind map sorting, graphic annotation, list recording, etc. Handwritten content can be compared with calculation results to help logic sorting and thinking presentation.

Third, the hardware design and adaptation function
With portability and stability as the core, durable materials and flexible adaptation design are adopted to meet the needs of multi-scene use, taking into account endurance and compatibility.

Folding portable design: the overall size is 162*85*17.5mm, and the weight is only 135g g. The folding structure can effectively protect the screen and buttons, which is convenient to carry in schoolbags and pockets, and is suitable for classroom, laboratory, office, outdoor and other scenes.

Dual power supply system: strong endurance, no need for frequent charging or battery replacement, energy saving and environmental protection, suitable for long-term outdoor use or emergency scenes.

Durable materials and technology: high-strength durable plastic shell, treated by ultrasonic technology, anti-fall and scratch; The board is covered with a matte brightness enhancement projection film, which is non-reflective and anti-glare, and can be used in conjunction with projection to adapt to teaching demonstration scenes.

Fourth, additional value-added functions
Personalized customization: supports logo customization and packaging customization, which can meet the needs of enterprise procurement and gift customization, and adapt to batch procurement scenarios.

Low power consumption and environmental protection: LCD handwriting screen has no backlight design, and only consumes a small amount of electricity when erasing and writing, further reducing energy consumption and practicing the concept of paperless environmental protection.

V. Summary of applicable scenarios
With the dual core advantages of "classic high-order operation+handwriting process recording", the equipment is widely suitable for various scenarios: junior and senior high school students can be used for preparing for competitions and calculating complex exercises; College students can meet the needs of advanced mathematics, physics, engineering and other professional courses and postgraduate entrance examination, and are compatible with all kinds of standardized examinations; Scientific research and engineering technicians can be used for data calculation, experimental records and scheme deduction; Teachers can be used for the deduction of higher-order formulas in class and teaching demonstration, giving consideration to practicality, professionalism and innovation.