计算:1²-2²+3²-4²+5²-6²+...+49²-50²急、在线等
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/21 06:59:29
![计算:1²-2²+3²-4²+5²-6²+...+49²-50²急、在线等](/uploads/image/z/766043-35-3.jpg?t=%E8%AE%A1%E7%AE%97%EF%BC%9A1%26%23178%3B-2%26%23178%3B%2B3%26%23178%3B-4%26%23178%3B%2B5%26%23178%3B-6%26%23178%3B%2B...%2B49%26%23178%3B-50%26%23178%3B%E6%80%A5%E3%80%81%E5%9C%A8%E7%BA%BF%E7%AD%89)
计算:1²-2²+3²-4²+5²-6²+...+49²-50²急、在线等
计算:1²-2²+3²-4²+5²-6²+...+49²-50²
急、在线等
计算:1²-2²+3²-4²+5²-6²+...+49²-50²急、在线等
1²-2²=-1-2
3²-4²=-3-4
5²-6²=-5-6
.
49²-50²=-49-50
1²-2²+3²-4²+5²-6²+...+49²-50²=-1-2-3-4-5-6-...-49-50=-25*51=-1275