已知A={(x,y)/ y=-x+3},B={(x,y)/ y=2x-1},求A交B
人气:316 ℃ 时间:2020-09-09 12:53:37
解答
A={(x,y)| y=-x+3},B={(x,y)| y=2x-1}
-x+3 = 2x-1
x= 4/3
when x=4/3 ,y =5/3
A∩B ={ (4/3,5/3) }
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