若x+y=4,则多项式½(x+y)+4﹙x-y)-3(x-y)-3/2(x+y)-x+y是多少?
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若x+y=4,则多项式½(x+y)+4﹙x-y)-3(x-y)-3/2(x+y)-x+y是多少?若x+y=4,则多项式½(x+y)+4﹙x-y)-3(x-y)-3/2(x+y)-x
若x+y=4,则多项式½(x+y)+4﹙x-y)-3(x-y)-3/2(x+y)-x+y是多少?
若x+y=4,则多项式½(x+y)+4﹙x-y)-3(x-y)-3/2(x+y)-x+y是多少?
若x+y=4,则多项式½(x+y)+4﹙x-y)-3(x-y)-3/2(x+y)-x+y是多少?
½(x+y)+4﹙x-y)-3(x-y)-3/2(x+y)-x+y
=1/2(x+y)+(x-y)-3/2(x+y)-(x-y)
=-(x+y)
=-4