The old and dangerous house in the neighborhood should be p________ down at once

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• The old and dangerous house in the neighborhood should be p________ down at once
• The old and dangerous house in the neighborhood should be p________ down at once
• 砌墙的砖头——————（ ）
• 已知实数m、n满足关系式（√m+1+m)(√n+1+n)=1 则m+n等于多少?