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变通有理数运算的有关符号法则,可以得到与之相关的许多基本规律,例如①如果若干数的和为正数,那么这些数中至少有一个正数。②如果若干个敬的和为负数,那么这些数中至少有一个负数。③如果若干个非零的数的和等于零,那么这些数至少有一个正数,也至少有一个负数。④若干个非零的数相乘(除),如果负数的个数是偶数,那么运算结果必为正数;如果负数的个数是奇数,那么运算结果必为负数。⑤若干个非零的数相乘(除),若运算结果为正数,则负数个数必为偶数个;若运算结果为负数,则负数个数必为奇数个。⑥偶数个数相乘(除),若运算结果为负敏,则至少有一个正数,也至少有一个负数。⑦一个不为零的数的奇次幂必与这个数
By adapting the relevant symbolic laws of rational number operations, we can get many basic rules related to it. For example, if the sum of several numbers is positive, then at least one of these numbers is positive. 2 If several respectful sums are negative, then at least one of these numbers is negative. 3 If the sum of several non-zero numbers is equal to zero, then these numbers have at least one positive number and at least one negative number. 4 Multiplication (division) of several non-zero numbers. If the number of negative numbers is even, the result of the operation must be positive. If the number of negative numbers is odd, the result of the operation must be negative. 5 Multiplication (division) of several non-zero numbers. If the result of the operation is positive, the number of negative numbers must be an even number; if the result of the operation is a negative number, the number of negative numbers must be an odd number. 6 Multiply (divide) even numbers. If the result is negative, there is at least one positive number and at least one negative number. 7 The odd power of a non-zero number must match this number