计算a-1/a-4 * a+2/a-2a+1 * a-4a+4/a+1

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计算a-1/a-4*a+2/a-2a+1*a-4a+4/a+1计算a-1/a-4*a+2/a-2a+1*a-4a+4/a+1计算a-1/a-4*a+2/a-2a+1*a-4a+4/a+1a-1/a-4

计算a-1/a-4 * a+2/a-2a+1 * a-4a+4/a+1
计算a-1/a-4 * a+2/a-2a+1 * a-4a+4/a+1

计算a-1/a-4 * a+2/a-2a+1 * a-4a+4/a+1
a-1/a-4 * a+2/a-2a+1 * a-4a+4/a+1 =(a+1)(a-1)/(a+2)(a-2)*(a+2)/(a-1)^2*(a-2)^2/(a+1) =(a-2)/(a-1)