为什么映客直播没声音:已知X+Y=-4，求1/2（X+Y)+4(X-Y)-3(X-Y)-3/2(X+Y)-X+Y

来源：百度文库编辑：查人人中国名人网时间：2024/04/28 12:17:24

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

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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