暑假期间,我在学习数学的间隙,偶然发现了一个运算法则,现陈述如下:计算一个十位数字是5的两位数(50到59)的平方时,我们可以进行速算.速算法则:一个十位数字是5的两位数的平方可以先写出5~2和个位数的和,再写出个位数的平方(个位数的平方不足10的前面加上一个数字0). During the summer, I was studying math gaps and accidentally discovered an algorithm, now stated as follows: Calculate a square when the tens digit is a double digit of 5 (50 to 59) The square of the two digits of the ten digit is five. Write the sum of five digits to two digits and then the square of one digit (one digit before the square of the digit less than 10).