计算:3xy[2xy-x(y-2)+x]
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计算:3xy[2xy-x(y-2)+x]
计算:3xy[2xy-x(y-2)+x]
计算:3xy[2xy-x(y-2)+x]
3xy[2xy-x(y-2)+x]
=3xy[2xy-xy+2x+x]
=3xy(xy+3x)
=3x²y²+9x²y
错了吧
大括号前面是不是漏了+或-
追问
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