Chameleon formula
Let's look at a formula: (2a-3b)×(2a+b). This formula seems ordinary, but it has magical changes.
Four small steps
We can solve this formula in four small steps: 2a×2a, 2a×b, (-3b)×2a, (-3b )× b, which seem simple, but they are the key to solve our problem.
Thinking and correcting mistakes
In the process of calculation, we need to constantly think about and correct mistakes. For example, when we calculate, we find that -6ab should be -3ab, because there is a -3b in front. At this time, it is necessary to find mistakes and correct them in time.
Final answer
Through four small steps of calculation and thinking about error correction, we got the final answer of this chameleon: 4A 2-3A B-3B 2. The answer seems simple, but it is the key to solve our problem.
Math can also be fun.
Through this little magic trick, we can find that mathematics can also be very interesting. As long as you master some tips, you can easily solve boring problems.