已知x+1/x=3,求3x/x²+1(/是分数线)
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已知x+1/x=3,求3x/x²+1(/是分数线)
已知x+1/x=3,求3x/x²+1(/是分数线)
已知x+1/x=3,求3x/x²+1(/是分数线)
答:
x+1/x=3
3x/(x²+1) 分子分母同除以x得:
=3/(x+1/x)
=3/3
=1