简化式子lx+1丨-丨x-1丨-丨x-3丨
答案:2 悬赏:20 手机版
解决时间 2021-12-01 23:58
- 提问者网友:無理詩人
- 2021-12-01 14:18
简化式子lx+1丨-丨x-1丨-丨x-3丨
最佳答案
- 五星知识达人网友:从此江山别
- 2021-12-01 15:02
解:
当x<-1时,
|x+1|-|x-1|-|x-3|
=-(x+1)-[-(x-1)]-[-(x-3)]
=-x-1+x-1+x-3
=x-5
当-1≤x<1时,
|x+1|-|x-1|-|x-3|
=(x+1)-[-(x-1)]-[-(x-3)]
=x+1+x-1+x-3
=3x-3
当1≤x<3时,
|x+1|-|x-1|-|x-3|
=(x+1)-(x-1)-[-(x-3)]
=x+1-x+1+x-3
=x-1
当x≥3时,
|x+1|-|x-1|-|x-3|
=(x+1)-(x-1)-(x-3)
=x+1-x+1-x+3
=5-x
当x<-1时,
|x+1|-|x-1|-|x-3|
=-(x+1)-[-(x-1)]-[-(x-3)]
=-x-1+x-1+x-3
=x-5
当-1≤x<1时,
|x+1|-|x-1|-|x-3|
=(x+1)-[-(x-1)]-[-(x-3)]
=x+1+x-1+x-3
=3x-3
当1≤x<3时,
|x+1|-|x-1|-|x-3|
=(x+1)-(x-1)-[-(x-3)]
=x+1-x+1+x-3
=x-1
当x≥3时,
|x+1|-|x-1|-|x-3|
=(x+1)-(x-1)-(x-3)
=x+1-x+1-x+3
=5-x
全部回答
- 1楼网友:酒醒三更
- 2021-12-01 15:48
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