题：在三角里填上3个数使其两两之和等于对应边上的数
Fill the correct numbers in the trangle to make the sum of any two equals to the number in its correspond side.
解：
第一步： 左右两边的数用大数减小数，并把差记在三角的顶角上.
Step1: Compare the numbers at left and right sides, and use the bigger one to subtract the smaller one, and mark the reulst in the top.
14-9=5
第二步： 用这个算的差加上对应边上的数。
Step 2: Use the result to add the number in the opposite side, then get the half of the sum.
5 + 17= 22
22的一半是11
the half of 22 is 11.
第三步： 取和的一半填在底边对应的两个格子中左右边大的那个空格內。
Step 3: Fill the half of the sum in one area which is lay down at the bottom side and the number at correspond side is biggher.
第四步：用数字的分与合，求出其它2个数。
Step 4: Use the addition and substraction to calculate left two numbers.
露莘长期研究k12数学，并有争夺k12数学的英文著作，对各种难题和挑战题颇有造诣，并发明多种适合各年龄段和不同年级的符和孩子们认知规律的快速解题方法！此为露莘发明的针对一年级小朋友的认知范围的解题方法！供小朋友和家长们参照，未经同意，不得作为商业用途！
Lucy has been long term focusing on reseach the K12 Maths and worked on the books of English K12 Maths, She is very good at finding the medthods for the kids in different level-age and grade to solve the changlengbale Maths problems, the "Lucy method" of "Numbering game in trangle" here are developed by Lucy for help parents and kids to quickly solve the problem, it is not for any commerical use without permittion!
关注微信公众号K12EEE，直接询问露莘老师问题！
Follow the wechat ID K12EEE and interact with Lucy!