计算3xy[2xy-x(y-2)+x-1]
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计算3xy[2xy-x(y-2)+x-1]计算3xy[2xy-x(y-2)+x-1]计算3xy[2xy-x(y-2)+x-1]3xy[2xy-x(y-2)+x-1]=3xy(2xy-xy+2x+x-1
计算3xy[2xy-x(y-2)+x-1]
计算3xy[2xy-x(y-2)+x-1]
计算3xy[2xy-x(y-2)+x-1]
3xy[2xy-x(y-2)+x-1]
=3xy(2xy-xy+2x+x-1)
=3xy(xy+3x-1)
=3x^2y^2+9x^2y-3xy
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