Starry Sky 202 1 New version of Xiaoshengchu Classification Volume, graduated from key middle schools and primary schools of famous schools in China through train, and enrolled students for further studies. The five-year classification of real questions always reviews the six-year special training real questions simulation classification test paper.
Xiaoshengchu refers to entering junior high school after graduating from primary school. There are generally primary school graduation exams and primary school graduation certificates, and now no one values this. If you want to enter junior high school, most junior high schools now have to take exams. In junior high schools with relatively good teaching quality, there are still scores restrictions, and students with poor grades have to pay more money for choosing schools.
The classification test paper of junior high school is divided according to the test topic, and the difficulty ladder rises, which is suitable for practice at all stages of junior high school. The answer is clear and detailed. There are many ways of thinking development in mathematics, such as multiple solutions to one problem, early warning of mistakes, thinking analysis, etc., to help children clear their minds and be coherent.
Update 1: When n = 1
L.H.S. = 1£¿ + 2? = 9 R.H.S. = 1£¿ 3? Can you explain it to me? ...
Update 2: L.H.S. = 1? + 2? + 3? +...+ (2k)£¿ + (2k + 1)£¿ + (2k + 2)£¿ E is not clear