化简:【a+b】²-c²分之a²-【b-c】²
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化简:【a+b】²-c²分之a²-【b-c】²
化简:【a+b】²-c²分之a²-【b-c】²
化简:【a+b】²-c²分之a²-【b-c】²
(a²-(b-c)²)/((a+b)²-c²)
=(a+b-c)(a-b+c)/((a+b+c)(a+b-c))
=(a-b+c)/(a+b+c)
(a-b+c)/(a+b+c)