中科新闻网梦幻诛仙洗魂:已知X+Y=-4，求1/2（X+Y)+4(X-Y)-3(X-Y)-3/2(X+Y)-X+Y
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1/2（X+Y)+4(X-Y)-3(X-Y)-3/2(X+Y)-X+Y
=1/2（X+Y)+4(X-Y)-3(X-Y)-3/2(X+Y)-(X-Y)
=1/2（X+Y)-3/2(X+Y)+ 4(X-Y)-3(X-Y)-(X-Y)
=1/2（X+Y)-3/2(X+Y)+0
=1/2（X+Y)-3/2(X+Y)
=-1（X+Y)
代入，得：
-1×4=-4
=4
已知X+Y=-4，求1/2（X+Y)+4(X-Y)-3(X-Y)-3/2(X+Y)-X+Y
解：1/2（X+Y)+4(X-Y)-3(X-Y)-3/2(X+Y)-X+Y
=1/2（X+Y)+4(X-Y)-3(X-Y)-3/2(X+Y)-(X-Y)
=1/2（X+Y)-3/2(X+Y)+ 4(X-Y)-3(X-Y)-(X-Y)
=-2/2(X+Y)+0
=-（X+Y)
=-（-4)
=4
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