|x|=7,|y|=12,且|x+y|=—(x+y),求x+y的值

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|x|=7,|y|=12,且|x+y|=—(x+y),求x+y的值|x|=7,|y|=12,且|x+y|=—(x+y),求x+y的值|x|=7,|y|=12,且|x+y|=—(x+y),求x+y的值|

|x|=7,|y|=12,且|x+y|=—(x+y),求x+y的值
|x|=7,|y|=12,且|x+y|=—(x+y),求x+y的值

|x|=7,|y|=12,且|x+y|=—(x+y)≥0

即

x+y≤0

所以

因为X+Y必须为为负数所以

可选择

2. X=7， Y=-12 X+Y=-5

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