A={x|x²-3x-4=0} ,B={x|ax²-x-a-1=0}若B⊆A,求a急,
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A={x|x²-3x-4=0} ,B={x|ax²-x-a-1=0}若B⊆A,求a急,
A={x|x²-3x-4=0} ,B={x|ax²-x-a-1=0}若B⊆A,求a
急,
A={x|x²-3x-4=0} ,B={x|ax²-x-a-1=0}若B⊆A,求a急,
A=﹛-1,4﹜B=﹛-1,a+1/a﹜B包含于A∴a+1/a=4∴a=1/3