(x2+1)/(x+2)+(2x+4)/(x2+1)=3
(x2+1)/(x+2)+(2x+4)/(x2+1)=3
數(shù)學人氣：391 ℃時間：2020-06-22 20:34:13
優(yōu)質(zhì)解答
令(x²+1)/(x+2)=y則（2x+4)/(x²+1）=2/y于是y+（2/y）=3得y=1或y=2當y=1時(x²+1)/(x+2)=1x²-x-1=0,得x=（1±√5）/2當y=2時(x²+1)/(x+2)=2x²-2x-3=0,得x=-1或x=3于是方程的解為（1±...
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