a-1/a平方-4a+4÷2a-2/a平方-4化简

问题描述:

a-1/a平方-4a+4÷2a-2/a平方-4
化简

把分母化成相同的数再算

=(a-1)/(a-2)² ÷2(a-1)/(a+2)(a-2)
=(a-1)/(a-2)² ×(a+2)(a-2)/2(a-1)
=(a+2)/2(a-2)
=(a+2)/(2a-4)