分式运算:(1)x^2-5x+6分之x^2-6x+8 · x^2-3x-4分之x^2-2x-3 (2)(a-b分之a+b-a分之b)· a-b分之ab(3)1÷(x- x^3分之2x^2-1)-x分之x-1 ÷(x-x分之1)(4)a^2+a-6分之a^2+5a+4 ÷a^2-6a+8分之a^2+3a-4 -1(急速)
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![分式运算:(1)x^2-5x+6分之x^2-6x+8 · x^2-3x-4分之x^2-2x-3 (2)(a-b分之a+b-a分之b)· a-b分之ab(3)1÷(x- x^3分之2x^2-1)-x分之x-1 ÷(x-x分之1)(4)a^2+a-6分之a^2+5a+4 ÷a^2-6a+8分之a^2+3a-4 -1(急速)](/uploads/image/z/15244117-61-7.jpg?t=%E5%88%86%E5%BC%8F%E8%BF%90%E7%AE%97%EF%BC%9A%EF%BC%881%EF%BC%89x%5E2-5x%2B6%E5%88%86%E4%B9%8Bx%5E2-6x%2B8+%C2%B7+x%5E2-3x-4%E5%88%86%E4%B9%8Bx%5E2-2x-3+%EF%BC%882%EF%BC%89%EF%BC%88a-b%E5%88%86%E4%B9%8Ba%2Bb-a%E5%88%86%E4%B9%8Bb%EF%BC%89%C2%B7+a-b%E5%88%86%E4%B9%8Bab%EF%BC%883%EF%BC%891%C3%B7%EF%BC%88x-+x%5E3%E5%88%86%E4%B9%8B2x%5E2-1%29-x%E5%88%86%E4%B9%8Bx-1+%C3%B7%EF%BC%88x-x%E5%88%86%E4%B9%8B1%EF%BC%89%EF%BC%884%EF%BC%89a%5E2%2Ba-6%E5%88%86%E4%B9%8Ba%5E2%2B5a%2B4+%C3%B7a%5E2-6a%2B8%E5%88%86%E4%B9%8Ba%5E2%2B3a-4+-1%28%E6%80%A5%E9%80%9F%EF%BC%89)
分式运算:(1)x^2-5x+6分之x^2-6x+8 · x^2-3x-4分之x^2-2x-3 (2)(a-b分之a+b-a分之b)· a-b分之ab(3)1÷(x- x^3分之2x^2-1)-x分之x-1 ÷(x-x分之1)(4)a^2+a-6分之a^2+5a+4 ÷a^2-6a+8分之a^2+3a-4 -1(急速)
分式运算:(1)x^2-5x+6分之x^2-6x+8 · x^2-3x-4分之x^2-2x-3 (2)(a-b分之a+b-a分之b)· a-b分之ab
(3)1÷(x- x^3分之2x^2-1)-x分之x-1 ÷(x-x分之1)
(4)a^2+a-6分之a^2+5a+4 ÷a^2-6a+8分之a^2+3a-4 -1
(急速)
分式运算:(1)x^2-5x+6分之x^2-6x+8 · x^2-3x-4分之x^2-2x-3 (2)(a-b分之a+b-a分之b)· a-b分之ab(3)1÷(x- x^3分之2x^2-1)-x分之x-1 ÷(x-x分之1)(4)a^2+a-6分之a^2+5a+4 ÷a^2-6a+8分之a^2+3a-4 -1(急速)
(1)x^2-5x+6分之x^2-6x+8 · x^2-3x-4分之x^2-2x-3
=(x-2)(x-4)/(x-2)(x-3)*(x-3)(x+1)/(x-4)(x+1)
=1
(2)(a-b分之a+b-a分之b)· a-b分之ab
=[a/(a-b)-b/(a-b)*ab/(a-b)
=ab/(a-b)
(3)1÷(x- x^3分之2x^2-1)-x分之x-1 ÷(x-x分之1)
=1÷[(1-2x²)/x(x²-1)]-(x-1)/x÷(x²-1)/x
=x(x²-1)/(1-2x²)-1/(x+1)
这个题目不清楚
(4)a^2+a-6分之a^2+5a+4 ÷a^2-6a+8分之a^2+3a-4 -1
=(a+1)(a+4)/(a+3)(a-2)÷(a+4)(a-1)/(a-2)(a-4)-1
=(a+1)(a-4)/(a+3)(a-1)-1
=(a²-3a-4-a²-2a+3)/(a+3)(a-1)
=(1-7a)/(a+3)(a-1)