"Introduction to Mathematics in Senior Four Schools" is quite good. It is more difficult to start from the third and fourth grades of primary schools, and there are many competition questions in senior six grades of primary schools. Then cooperate with the "senior four school competition mathematics textbook" or find an Olympic math teacher. I have just learned some competition questions for junior students, such as Hope Cup, Cup, Cup and Spring Festival Cup. Pay attention to the fact that you just learn to use equations less or try not to use them, because Olympiad should exercise reverse thinking and equations are positive thinking. A slightly more difficult problem is to use equations, which will not happen in the future. Wait and see.

The fifth and sixth grades use some simple equations, especially the sixth grade's "Introduction to Mathematics in Senior Four Schools". Patience is very important in learning Olympic Mathematics. I am in the sixth grade of primary school, and sometimes it takes nearly 2 hours to do an Olympic math problem!

By the way, I'll show you a problem I just worked out (for fear of laughing at me because I'm a pupil):

Two submarines, the Pacific Ocean and the Arctic Ocean, are sailing in a straight line in the same direction, with the Arctic Ocean in front and the Pacific Ocean behind. At one moment, the Pacific ocean sends out sound waves, and two seconds later, it sends out sound waves again. When sound waves reach the Arctic Ocean, the Arctic Ocean will reflect them. It is known that the speed of the Pacific Ocean is 54 kilometers per hour, the time interval between the first and second detection of reflected sound waves from the Arctic Ocean is 2.0 1 second, and the sound wave propagation speed is 1 185 meters per second. Excuse me, how many kilometers per hour is the Arctic Ocean?

My answer is 64 and 165438+7/0 (from noon! ! )