1、(a-b)/(a^2-2a+1),(2a+3)/(2a-a^2-1)
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1、(a-b)/(a^2-2a+1),(2a+3)/(2a-a^2-1)
2、(a-1)/(a+1)^2-4,(1-a)/(2-4a+2a^2)
还不够清楚么?(a-b)/(a^2-2a+1)和(2a+3)/(2a-a^2-1)通分
(a-1)/(a+1)^2-4和(1-a)/(2-4a+2a^2)通分,
2、(a-1)/(a+1)^2-4,(1-a)/(2-4a+2a^2)
还不够清楚么?(a-b)/(a^2-2a+1)和(2a+3)/(2a-a^2-1)通分
(a-1)/(a+1)^2-4和(1-a)/(2-4a+2a^2)通分,
1、(a-b)/(a^2-2a+1),(2a+3)/(2a-a^2-1)
(a-b)/(a^2-2a+1)=(a-b)/(a-1)^2
(2a+3)/(2a-a^2-1)=(2a+3)/-(a-1)^2=(-2a-3)/(a-1)^2
2、(a-1)/(a+1)^2-4,(1-a)/(2-4a+2a^2)
(a-1)/(a+1)^2-4=(a-1)/a^2+2a+1-4=(a-1)/a^2+2a-3=(a-1)/(a-1)(a+3) =1/(a+3)
(1-a)/(2-4a+2a^2) =(1-a)/2(a^2-2a+1)=(1-a)/2(a-1)^2=1/2(1-a)
通分后(a-1)/(a+1)^2-4=(2-2a)/2(1-a)(a+3)
(1-a)/(2-4a+2a^2)=(a+3))/2(1-a)(a+3)
(a-b)/(a^2-2a+1)=(a-b)/(a-1)^2
(2a+3)/(2a-a^2-1)=(2a+3)/-(a-1)^2=(-2a-3)/(a-1)^2
2、(a-1)/(a+1)^2-4,(1-a)/(2-4a+2a^2)
(a-1)/(a+1)^2-4=(a-1)/a^2+2a+1-4=(a-1)/a^2+2a-3=(a-1)/(a-1)(a+3) =1/(a+3)
(1-a)/(2-4a+2a^2) =(1-a)/2(a^2-2a+1)=(1-a)/2(a-1)^2=1/2(1-a)
通分后(a-1)/(a+1)^2-4=(2-2a)/2(1-a)(a+3)
(1-a)/(2-4a+2a^2)=(a+3))/2(1-a)(a+3)
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