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1 引言有理数n叫做同余数,如果它是三边边长都是有理数的直角三角形的面积。用式子来表示就是说:如果有三个正有理数X,Y,Z适合条件
1 Introduction A rational number n is called a congruent if it is an area of a right-angled triangle with a rational number. Expressed by the formula: If there are three positive rational numbers X, Y, Z suitable conditions