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求1/(4+9x^2)的不定积分 求1/(4x^2+4x+5)的不定积分

详细解答如下,点击放大:

1.9x-9/4-4x =9(x-1)/4(1-x) =-9/4 2.x^2-1/x^2+x-2 =(x+1)(x-1)/(x-1)(x+2) =(x+1)/(x+2) 3.x^2-4x+4/2x-4 =(x-2)²/2(x-2) =(x-2)/2 4.3x^2-9x-12/x^2+2x+1 =3(x-4)(x+1)/(x+1)² =3(x-4)/(x+1) 5.x^2-7x+12/-x^2+9x-20 =(x-3)(x-4)/-...

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