2^2-16/a^-2a-3 *a-3/a^2-5a+4 化简
1个回答
=(a+4)(a-4)/(a-3)(a+1) ×(a-3)/(a-4)(a-1)
=(a+4)/(a+1)(a-1)
=(a+4)/(a²-1)
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