In solving the equation, Xiao Hua, a student of class 2, Grade 7, polluted a constant in the equation and could not see clearly. The polluted equation was 2y-1 / 2= 2y-1 / 2 = 1 / 2Y + [] how to do? Xiaohua thought about it, and then turned to the book to find that the solution is y = 5 / 3, so he made up the constant and finished the assignment. What's the constant? The equation and process and three grams of oil!

In solving the equation, Xiao Hua, a student of class 2, Grade 7, polluted a constant in the equation and could not see clearly. The polluted equation was 2y-1 / 2= 2y-1 / 2 = 1 / 2Y + [] how to do? Xiaohua thought about it, and then turned to the book to find that the solution is y = 5 / 3, so he made up the constant and finished the assignment. What's the constant? The equation and process and three grams of oil!

2y-1/2y=1/2+【 】
3/2y=1/2+【 】
Take y = 5 / 3 in
5/2=1/2+【 】
So, [] = 5 / 2-1 / 2 = 4 / 2 = 2

Xiao Cong is n years old. His father is five years older than twice his age. How old is his father in three years?

Suppose n is 10 years old, and his father's age is 2 times that of XiaoCong + 5 years old. The basic formula is n * 2 + 5, but remember to add n. after all, the so-called 2 times plus the original number plus 3, then n * 2 + 5 + N + 3 = 38

Dawei and his father are 44 years old this year. His father is three times as old as Dawei. How old are Dawei and his father this year?

Dawei: 44 (1 + 3), = 44 (4), = 11 (years old), Dad: 11 × 3 = 33 (years old); a: Dawei's age is 11, Dawei's dad's age is 33