三角形个数的规律公式图片

简介：Since last year, heavy rainstorms in Jiangsu, Zhejiang and other places have caused the sea water to swell, and there has even been heavy snow. Disaster memorials have been sent to his desk. In the memorial, the governor of the south bluntly said: The people have reached the point where every family is hanging. Please consider reducing the taxes in the south so that the people can have enough money to fight.