设4∧x=8∧(y-1),且9∧y=27∧(x-1),则x-y等于

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设4∧x=8∧(y-1),且9∧y=27∧(x-1),则x-y等于设4∧x=8∧(y-1),且9∧y=27∧(x-1),则x-y等于设4∧x=8∧(y-1),且9∧y=27∧(x-1),则x-y等于

设4∧x=8∧(y-1),且9∧y=27∧(x-1),则x-y等于
设4∧x=8∧(y-1),且9∧y=27∧(x-1),则x-y等于

设4∧x=8∧(y-1),且9∧y=27∧(x-1),则x-y等于