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有些计算器使用 [RAD]弧度模式或者Radian (1 RAD = 57,296°)作为标准设定。 [RAD]（弧度）模式，通常用于高等教育，例如: 纯物理学。 Free simple calculator for adding, subtracting, multiplying, dividing. 1966年中国数学家陈景润提出“1+2”定理，证明大偶数可表示为一个质数与一个至多含两个质因数的数之和，这是迄今最接近原猜想的结果。

Free online scientific notation calculator Simple online calculator with memory functions similar to a basic handheld calculator Solve advanced problems in physics, mathematics and engineering

Math expression renderer, plots, unit converter, equation solver, complex numbers, calculation history.

It shows what to do first, how each step builds on the last, and how each move brings you closer to the solution It supports topics such as algebra, calculus, trigonometry, and more. Web2.0calc.com online calculator provides basic and advanced mathematical functions useful for school or college You can operate the calculator directly from your keyboard, as well as using the buttons with your mouse

This guide will give you informative instructions on how to use this calculator effectively. The algebra section allows you to expand, factor or simplify virtually any expression you choose. 下面介绍一下哥德巴赫猜想的一些情况，后面会详细说明为何被称为“1+1”问题。 1742年，哥德巴赫提出了两个猜想，分别被称为奇数哥德巴赫猜想和偶数哥德巴赫猜想。

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