=（），=（）-七年级数学

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• （x﹣1+y﹣1）﹣1=[]A．x=yB．C．D．-七年级数学
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• （a3n+2÷an）0=（）；=（）．-七年级数学
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• 若（x﹣1）x+1=1，则x=（）．-七年级数学
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