∫ [(x^3-2x^2+x+1)/(x^4+5x^2+4)]dx

∫ [(x^3-2x^2+x+1)/(x^4+5x^2+4)]dx ∫2^x*3^x/(9^x-4^x) dx ∫(3x^4+x^2)/(x^2+1)dx ∫(x^4-4x^2+5x-15)/(x^2+1)(x-2) dx=? ∫（x^2+1/x^4)dx ∫1/(x^4-x^2)dx 计算 ∫（x^4-2x^3+x^2+1）/x（x-1)² dx ∫(5x^2-x+1)/(x^3-4x^2)dx 不定积分x^7dx/(x^4+2) 不定积分(3x^4+x^3+4x^2+1)dx/(x^5+2x^3+x) 不定积分d ∫（(x+2)/4x(x^2-1)）dx 积分∫x/[(x^2+1)(x^2+4)]dx 不定积分f(x^2+3x+4)/(x-1)dx