Science and nature A super-deep math textbook. School will never teach you.

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Science and Nature
Books to understand the true meaning of the "formula" of mathematics : "Why do you calculate x or ÷ before + or -?" "Why do you multiply by inverting the denominator and the numerator when you divide a fraction?" "The answer of 2 ÷ 0 is not really 0?" I think many people were taught only by teachers when they were in elementary school about the calculation of mathematics and the formula of figures. However, when you dig deeper into such formulas, in fact, the true "fun" of the learning of mathematics is hidden behind them. Therefore, in this book, the operator of the super popular website of mathematics, which boasts 1,500,000 PV per month, explains the true meaning of the formula of mathematics, which was not taught at school! There is no doubt that you will wake up to the "real fun" of mathematics!