4x²y-{6xy-2(4xy-2)-x²y}+1
=4x²y-(6xy-8xy+4-x²y)+1
=4x²y-6xy+8xy-4+x²y+1
=5x²y+2xy-3
=5*(-2分之1)²*1+2*(-2分之1)*1-3
=4分之5-1-3
=4分之5-4
=4分之5-4分之16
=-4分之11
=-2又4分之34x的平方Y-{6xy-2(4xy-2)-x的平方y}+1麻烦用初一的格式，我加分用的都是初一的格式，你仔细看看，有什么地方不懂的可以追问！4x的平方Y-{6xy-2(4xy-2)-x的平方y}+1再算下，你这个我没看懂，答案4x²y-{6xy-2(4xy-2)-x²y}+1 先去掉小括号=4x²y-(6xy-8xy+4-x²y)+1再去掉中括号=4x²y-6xy+8xy-4+x²y+1合并同类项=5x²y+2xy-3 代入数据=5×(-2分之1)²×1+2×(-2分之1)×1-3=4分之5-1-3=4分之5-4=4分之5-4分之16=-4分之11=-2又4分之3