We are 30 years old, and we occasionally have to find some small challenges in life to wake up our minds, just like this math problem, which looks like four boxes to fill in the numbers, so that the horizontal and vertical equations are true, but in fact, there is a hidden mystery, which is especially suitable for the brain to set a mini fitness.

Let's start by giving four boxes from top to bottom, from left to right, called a, b, c, d, so there are a bunch of equations: (a b=8) (the first row adds up to 8), (c-d=6) (the third row subtracts to 6), (a c=13) (the first column adds up to 13), (b d=8) (the second column adds up to 8). At this time, it has to be broken down into small steps, just like solving difficult problems in life

From (a b=8), (b=8-a) (b is equal to 8 minus a);From (c-d=6) also varies, (d=c-6) (d is c minus 6). Substituting these two "transformed" formulas into (b d=8) becomes (8-a c-6=8), which is simplified to (c-a=6) (c is greater than a6 )

Combine (a c=13) (a and c add up to 13), put these two equations together, (c-a=6) and add (a c=13) to calculate (c=9.

5), and then follow the vine to find (a=3.5) ,(b=4.5) ,(d=3.5)

The moment you calculate the result, is it like overcoming a small difficulty in life? At the age of 30, when we encounter challenges in work and life, we have to dismantle and solve them like this, even if the idea of solving academic problems is easy to apply to reality! The next time we encounter a difficult problem, just think about the process of solving this problem, we are 30 years old, our brains are turning, and we can get through any hurdle.