4x的2次方y(tǒng)-【6xy-3(4xy-2)+4x的2次方y(tǒng)】+1
=4x²y-6xy+12xy-6-4x²y+1
=6xy-5
=6×2×(-1/2)-5
=-11;
手機提問的朋友在客戶端右上角評價點【滿意】即可.先化簡在求值：
4x的2次方y(tǒng)-【6xy-3(4xy-2)+4x的2次方y(tǒng)】+1其中x=2,y=-2分之1