Science and nature Super-deep math textbooks are never taught in schools.

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Science and nature
A book that shows the true meaning of "formulas" in mathematics : "Why do you calculate + ya-yori * or ÷ first?" "Why do you multiply by flipping the denominator and the numerator when dividing fractions?" "The answer to 2 ÷ 0 is not really 0?" I think many people, when they were in elementary school, had only been told by their teachers about arithmetic calculations and mathematical formulas. "This is what it is!" But when they delve into such formulas, the real "fun" of the science of mathematics is hidden behind them. This book explains the true meaning of math formulas that were not taught at school by the operator of a super popular math site that boasts 1,500,000 PV per month! You will surely be awakened to the "real fun" of mathematics!