求不定积分∫(x+3)/(x²+5x+6)dx
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求不定积分∫(x+3)/(x²+5x+6)dx
求不定积分∫(x+3)/(x²+5x+6)dx
求不定积分∫(x+3)/(x²+5x+6)dx
∫(x+3)/(x²+5x+6)dx
=∫(x+3)/(x+2)(x=3)dx
=∫1/(x+2)dx
=ln|x+2|+c
盯着分母想办法