在现行初中代数的教学大纲中，在“有理数”之后，引进无理数之前，包括了许多内容：整式和分式及其运算、一元一次方程和二元一次方程组、一元一次不等式、因式分解等．然后从数的开方问题引起，说明了无理数和实数的概念．在１９９３年的教材中，无理数的引进是这样开始... In the current syllabus of junior middle school algebra, after the introduction of irrational numbers after the “rational numbers”, it includes many contents: integral equations and fractions and their operations, one-ary-one-time equations and binary one-order equations, one-time inequality, factorization, etc. . Then the problem arises from the square root of the number, which explains the concept of irrational numbers and real numbers. In the 1993 textbook, the introduction of irrational numbers started like this...