题目:在右图的六个○里填上1、2、3、4、5、6(每个数只能用一次),使每条线上的三个数相加的和都相等。【分析与解】这是一个三角形填数的题目,它有自身的特点和解答方法。特点是:需要填的六个数是连续数(如1、2、3、4、5、6);或者是六个“差相等”的数(如1、3、5、7、9、11,或5、10、15、20、25、30)。解答方法:把六个数从小到大依次排列后,有4种不同 Title: Put 1, 2, 3, 4, 5 and 6 on the right half of the figure (each time can only be used once) so that the sum of the three numbers in each line are the same. 【Analysis and Settlement】 This is a triangle fill the title, it has its own characteristics and solutions. The features are: the six numbers that need to be filled are consecutive numbers (such as 1, 2, 3, 4, 5, 6); or the number of six “equal” (such as 1,3,5,7,9 , 11, or 5, 10, 15, 20, 25, 30). Answer: The six numbers from small to large arranged in order, there are 4 different