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... der at the magic of multiplication, subtraction, and division.
In this era, there were calculations, but they were too troublesome. If numbers can be manipulated as easy as this, then he believed addition, subtraction, multiplication, and division would bring great convenience to the people.
“The Imperial Tutor previously always said that he wanted to reform the imperial examinations and depose of the myriad of family techniques so that only one standard will be left. I felt that it ...
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