有B可知：
(x,y)的值有（0,3）,（1,2）,（2,1）,（3,0）四组.
分别代入A集合中可得：m=1,3,10/3三个值,
他们分别不同,故即为解.
已知集合A={（X,Y）|Y=-X^2+mx-1},B={(x,y)|x+y=3,0
已知集合A={（X,Y）|Y=-X^2+mx-1},B={(x,y)|x+y=3,0
数学人气：990 ℃时间：2019-12-13 18:21:36
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