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(4)不是由开平方得到的无理数 前面说到,开平方是无理数的一个来源.一个正有理数,对它开平方,如果开不尽,那么这个有理数的平方根是无理数.如我们已经熟悉的
(4) An irrational number that is not derived from square root. As mentioned above, square root is a source of irrational numbers. A positive rational number squares it. If it is not open, the square root of this rational number is an irrational number. As we are already familiar with