请帮我用小学生的思维分析解答这道题---Wrap up 1 Applying the "Combine the numbers" method : * Step 1: Find a number closest to the result. * Step 2: Find the difference between the closest number and the result. * Step 3: Add or subtract the remaining numbers to get the difference. * Step 4: Fill in "+" or "-" in the appropriate place. [Image shows the following calculation illustration] 2 3 4 5 6 7 = 252 [Numbers 2 3 4 are grouped] [Downward arrow] 252 - 234 = 18 5 + 6 + 7 = 18 2 3 4 + 5 + 6 + 7 = 252