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已知集合A=[x|x^2=1},B={x|ax=1}.若B是A的子集,求实数a的值
人气:249 ℃ 时间:2019-08-24 04:39:52
解答
A=[x|x^2=1}
= { -1,1}
B is subset of A
then
ax =1
a = 1/x ( x = -1 or 1 )
= -1 or 1 #
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