=3x^2y-2xy^2+2(xy-3/2x^2y)-xy+3xy^2
=3x^2y+xy^2+2xy-3x^2y-xy
=xy+xy^2
=3*(-1/3)+3*1/9
=-2/3
当x=3,y=-1/3时求代数式3x*xy-[2xy*y-2(xy-2/3x*xy)+xy]+3xy*y的值
当x=3,y=-1/3时求代数式3x*xy-[2xy*y-2(xy-2/3x*xy)+xy]+3xy*y的值
数学人气:717 ℃时间:2019-08-17 22:56:25
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