问题描述: 已知(x-2)2+|xy-4|=0,求3x2y+{-2x2y-[-2xy+(x2y-4x2)-xy]+xy2}. 1个回答 分类:数学 2014-11-07 问题解答: 我来补答 3x2y+{-2x2y-[-2xy+(x2y-4x2)-xy]+xy2}=3x2y+{-2x2y-[-2xy+x2y-4x2-xy]+xy2}=3x2y+{-2x2y+2xy-x2y+4x2+xy+xy2}=3x2y-2x2y+2xy-x2y+4x2+xy+xy2=3xy+xy2+4x2,∵(x-2)2+|xy-4|=0,∴x-2=0,xy-4=0,∴x=2,y=2,把x=2,y=2代入原式得:=3×2×2+2×22+4×22=36. 展开全文阅读