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Science,English,and math Ⅱ

No.36　17/04/30 18:22
燻し銀三 ( 50代 ♂ Oe38xe ) あ+あ-

【Expansion to a rational number】

《The concept of number extends from the four basic operation of arithmetic to a rational number》

There are two simple questions to which almost all of us used to occur with regard to the four basic operation of arithmetic on rational number. The author said."I'm going to answer them."

The one is addition of fractional numbers. For example,when a half is added to one-third,its answer is two-fifths,isn't it? Without reducing the fractions to a common denominator 通分,we add one fractional number to the other as they are,its answer becomes like that,but needless to say it's in the wrong.

There are illustrations for the answer in the book. They are two rectangles. They are the same size,but the one is divided into two and the other is done into three,

And there are three other illustrations. Each of them are divided into six. One of them is black on the part of its one-third,and the other is black on the part of its half,and the last one is black on the…