题目
若|x|=3,|y|=5,且|x+y|=-(x+y),求y-x的值.
提问时间:2021-01-09
答案
∵|x|=3,|y|=5,
∴x=±3,y=±5,
∵|x+y|=-(x+y),
∴x+y≤0,
∴x=±3,y=-5,
y-x=-5-3=-8,
或y-x=-5-(-3)=-5+3=-2.
∴x=±3,y=±5,
∵|x+y|=-(x+y),
∴x+y≤0,
∴x=±3,y=-5,
y-x=-5-3=-8,
或y-x=-5-(-3)=-5+3=-2.
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