-1∠x+y
-1∠x+y
数学人气:670 ℃时间:2020-04-06 00:47:46
优质解答
设m=x+y,n=x-y,则x=(m+n)/2,y=(m-n)/2,则Z=m+n-3/2*(m-n)=5n/2-m/2,所以:3<z<8.
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