Report copyright - - 1 -photo.sohu.com/20040923/Img222194341.pdf5 4 3 2 99 98 97 96 95( 2) 5 4 3 2 2. ∫ x 1+x4 dx 解. ∫∫∫∫ + =− + =− + − = + 2 2 2 4 4 4 2 4 2 1 1 1 1 1 1 1/ 1 t dt t
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