如果丨x丨=5,丨y丨=7,丨x+y=-(x+y),求x+y的值马上要~快

来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 18:11:55
如果丨x丨=5,丨y丨=7,丨x+y=-(x+y),求x+y的值马上要~快如果丨x丨=5,丨y丨=7,丨x+y=-(x+y),求x+y的值马上要~快如果丨x丨=5,丨y丨=7,丨x+y=-(x+y),

如果丨x丨=5,丨y丨=7,丨x+y=-(x+y),求x+y的值马上要~快
如果丨x丨=5,丨y丨=7,丨x+y=-(x+y),求x+y的值
马上要~快

如果丨x丨=5,丨y丨=7,丨x+y=-(x+y),求x+y的值马上要~快
因为|x+y|=-(x+y)
所以x+y

x+y=-(x+y),
(x+y)+(x+y)=0
2(x+y)=0
x+y=0

少个绝对值符号吧??