4个回答
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第一题
(x²-1)/(x²-2x+1)÷(x+1)/(x-1)·(x-1)/(x+1)
=(x-1)/(x-1)·(x-1)/(x+1)
=(x-1)/(x+1)
第二题
[1-1/(1-x)]·(x-1)/x
=(1-x-1)/(1-x)·(x-1)/x
=x/(x-1)·(x-1)/x
=1
第三题
(a-3)/(a²-2a)÷[a+2-5/(a-2)]
=(a-3)/a(a-2)÷[(a²-4-5)/(a-2)]
=(a-3)/a(a-2)·(a-2)/(a²-9)
=1/(a²+3a)
第四题
1/(m+1)-1/(m²-1)+(m+1)/(m²-2m+1)
=(m-1)²/(m+1)(m-1)²-(m-1)/(m²-1)(m-1)+(m+1)²/(m-1)²(m+1)
=(m²-2m+1-m+1+m²+2m+1)/(m-1)²(m+1)
=(2m²-m+3)/(m-1)²(m+1)
第五题
[(a²+4b²+4ab)/(a+2b)-(4a²-b²)/(2a-b)]÷(a-b/2)
=(a+2b-2a-b)·2/(a-b)
=(b-a)·2/(a-b)
=-2
(x²-1)/(x²-2x+1)÷(x+1)/(x-1)·(x-1)/(x+1)
=(x-1)/(x-1)·(x-1)/(x+1)
=(x-1)/(x+1)
第二题
[1-1/(1-x)]·(x-1)/x
=(1-x-1)/(1-x)·(x-1)/x
=x/(x-1)·(x-1)/x
=1
第三题
(a-3)/(a²-2a)÷[a+2-5/(a-2)]
=(a-3)/a(a-2)÷[(a²-4-5)/(a-2)]
=(a-3)/a(a-2)·(a-2)/(a²-9)
=1/(a²+3a)
第四题
1/(m+1)-1/(m²-1)+(m+1)/(m²-2m+1)
=(m-1)²/(m+1)(m-1)²-(m-1)/(m²-1)(m-1)+(m+1)²/(m-1)²(m+1)
=(m²-2m+1-m+1+m²+2m+1)/(m-1)²(m+1)
=(2m²-m+3)/(m-1)²(m+1)
第五题
[(a²+4b²+4ab)/(a+2b)-(4a²-b²)/(2a-b)]÷(a-b/2)
=(a+2b-2a-b)·2/(a-b)
=(b-a)·2/(a-b)
=-2
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