化简(1-1/x)÷x2-2x+1/x2-1 和(1/a+1+1/a-1)÷a/a+1+1
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化简(1-1/x)÷x2-2x+1/x2-1 和(1/a+1+1/a-1)÷a/a+1+1
化简(1-1/x)÷x2-2x+1/x2-1 和(1/a+1+1/a-1)÷a/a+1+1
化简(1-1/x)÷x2-2x+1/x2-1 和(1/a+1+1/a-1)÷a/a+1+1
化简(1-1/x)÷x2-2x+1/x2-1
=(x-1)/x×(x²-1)/(x-1)²
=(x+1)/x;
=1+1/x;
和(1/a+1+1/a-1)÷a/a+1+1
=(a-1+a+1)/(a²-1)×(a+1)/a+1
=2/(a-1)+1
=(2+a-1)/(a-1)
=(a+1)/(a-1);
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