若|x+7|+|y-4|=0,则xy=()快,现在要用!
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![若|x+7|+|y-4|=0,则xy=()快,现在要用!](/uploads/image/z/14140417-49-7.jpg?t=%E8%8B%A5%7Cx%2B7%7C%2B%7Cy-4%7C%3D0%2C%E5%88%99xy%3D%EF%BC%88%EF%BC%89%E5%BF%AB%2C%E7%8E%B0%E5%9C%A8%E8%A6%81%E7%94%A8%21)
若|x+7|+|y-4|=0,则xy=()快,现在要用!
若|x+7|+|y-4|=0,则xy=()
快,现在要用!
若|x+7|+|y-4|=0,则xy=()快,现在要用!
|x+7|+|y-4|=0
|x+7|=0,|y-4|=0
X=-7,Y=4
XY=(-7)×4=-28
答案应该是0
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