这是道计算题,
来源:学生作业学帮网 编辑:学帮网 时间:2024/06/25 21:36:20
这是道计算题,
2/(x+1)(x+3)+2/(x+3)(x+5)+.2/(x+1997)(x+1999)
=1/(x+1)-1/(x+3)+1/(x+3)-1/(x+5)+1/(x+5)-.-1/(x+1997)+1/(x+1997)-1/(x+1999)
=1/(x+1)-1/(x+1999)
=(x+1999-x-1)/(x+1)(x+1999)
=1998/(x+1)(x+1999)
收录互联网各类作业题目,免费共享学生作业习题
慧海网手机作业共收录了 千万级 学生作业题目
来源:学生作业学帮网 编辑:学帮网 时间:2024/06/25 21:36:20
这是道计算题,
2/(x+1)(x+3)+2/(x+3)(x+5)+.2/(x+1997)(x+1999)
=1/(x+1)-1/(x+3)+1/(x+3)-1/(x+5)+1/(x+5)-.-1/(x+1997)+1/(x+1997)-1/(x+1999)
=1/(x+1)-1/(x+1999)
=(x+1999-x-1)/(x+1)(x+1999)
=1998/(x+1)(x+1999)