若|x|=5,|y|=3,则|X+Y|=
4个回答
|x|=5,|y|=3
若x=5 y=3 |x+y|=8
x=5,y=-3 |x+y|=2
x=-5,y=3 |x+y|=2
x=-5,y=-3 |x+y|=8
所以|x+y|=8或者2
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