(A+1)(A-1)/(A^2+2A-3)
=(A+1)(A-1)/[(A+3)(A-1)]
=(A+1)/(A+3)
A的平方+2A-3分之(A+1)乘(A-1) 此分式约分
A的平方+2A-3分之(A+1)乘(A-1) 此分式约分
数学人气:196 ℃时间:2019-10-24 07:11:57
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