Question

若有理数x,y满足|x|=x,|y|=-y,且|x|〈|y|,化简|x|-|y|-|x-y|

若有理数x,y满足|x|=x,|y|=-y,且|x|〈|y|,化简|x|-|y|-|x-y|
若有理数x,y满足|x|=x,|y|=-y,且|x|〈|y|,化简|x|-|y|-|x+y|
此题写错,重答

Answer 1

解：∵|x|=x,|y|=-y
∴x≥0,y≤0
∴x≥y
x+y≥0,|x+y|=x+y
∴|x|-|y|-|x+y|=x-(-y)-(x+y)=x+y-x-y=0

O(∩_∩)O哈哈~2分又到手了···

Answer 2

|x|=x,|y|=-y
所以x>=0,y<=0
所以x>=y
x-y>=0,|x-y|=x-y
所以|x|-|y|-|x-y|=x-(-y)-(x-y)=x+y-x+y=2y

Answer 3

X>=0
Y<=0
|X-Y|=|x|+|y|
|X|-|y|-|x-Y|=-2|y|=2y

Answer 4

jiajshai