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!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+
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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