(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]写错了。是(a^2-1)*[2a^2-3a+5/a^2-1 -(1-2a/1-a) - 4/1+a]
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![(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]写错了。是(a^2-1)*[2a^2-3a+5/a^2-1 -(1-2a/1-a) - 4/1+a]](/uploads/image/z/12286727-71-7.jpg?t=%28a%5E2-1%29%2A%5B2a%5E2-3a%2B5%2Fa%5E2-1+-%282a%2F1-a%29+-+4%2F1%2Ba%5D%E5%86%99%E9%94%99%E4%BA%86%E3%80%82%E6%98%AF%28a%5E2-1%29%2A%5B2a%5E2-3a%2B5%2Fa%5E2-1+-%281-2a%2F1-a%29+-+4%2F1%2Ba%5D)
(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]写错了。是(a^2-1)*[2a^2-3a+5/a^2-1 -(1-2a/1-a) - 4/1+a]
(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]
写错了。是(a^2-1)*[2a^2-3a+5/a^2-1 -(1-2a/1-a) - 4/1+a]
(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]写错了。是(a^2-1)*[2a^2-3a+5/a^2-1 -(1-2a/1-a) - 4/1+a]
(a^2-1)*[2a^2-3a+5/a^2-1 -(2a/1-a) - 4/1+a]
=(a^2-1)*[(2a^2-3a+5)/(a^2-1) -(1-2a/(1-a) - 4/(1+a)]
=(a^2-1)*(2a^2-3a+5)/(a^2-1) -(a^2-1)*(1-2a)/(1-a) - (a^2-1)*4/(1+a)
=(2a^2-3a+5) -(a-1)(a+1)*(1-2a)/(1-a) - (a-1)(a+1)*4/(1+a)
=(2a^2-3a+5) +(a-1)(a+1)*(1-2a)/(a-1) -4 (a-1)
=(2a^2-3a+5) +(1-2a)(a+1)-4 (a-1)
=2a^2-3a+5 +1+a-2a^2-2a-4a+4
=2a^2-2a^2+a-2a-3a-4a+5 +1+4
=-8a+10
2a/1-a) 你是不是写错了?
原式=(a+1)(a-1)[(2a²-3a+5)/(a+1)(a-1)+2a/(a-1)-4/(a+1)]
=(a+1)(a-1)(2a²-3a+5)/(a+1)(a-1)+(a+1)(a-1)*2a/(a-1)-(a+1)(a-1)*4/(a+1)
=(2a²-3a+5)+2a(a+1)-4(a-1)
=2a²-3a+5+2a²+2a-4a+4
=4a²-5a+9