In the past, my daughter was not good at arithmetic, mainly because her logical ability was too weak, but after playing more logical games in her mind, her logical ability improved a lot. Watching her do math application problems shows that she is organized and rarely deducts points from them. It is said that logical ability is the strong backing of mathematics and physics, which is really the case! Not only that, but also her daughter's memory is surprisingly good. She used to have a good memory. She likes to play puzzle games that challenge her memory. Now she is radiant. At the parent-teacher meeting, her teacher praised her for always reciting Tang poems and texts the fastest in the whole class.
I'm sorry, I'm so proud of my daughter. I digress ... I mean, giving a 9-year-old child a game machine that can start his brain as a birthday present is not only a temporary favor for the child, but also a great benefit to his growth. At least I tasted the sweetness:) Happy birthday to your child!
The solution process is shown in the above four screenshots.
The four questions you uploaded all belong to the combination of factorization, squar