x*x+3x-1=0 求(1)x+1/x (2) x+1/x/x
(3)x+1/x/x/x (4)x+1/x/x/x/x
(5) x+1/x/x/x/x/x
∵x*x+3x-1=0
除以x得,x+3-1/x=0整理得 x-1/x=-3平方得.x^2+1/x^2=11,
(1)x+1/x=√13,
※以下表达式不大白!
(2) x+1/x/x
(3)x+1/x/x/x (4)x+1/x/x/x/x
(5) x+1/x/x/x/x/x
以上两种解答都得先交待一下X不等于0.
事实上若X等于0,则前提矛盾.
∵x*x+3x-1=0
除以x得,x+3-1/x=0整理得 x-1/x=-3平方得.x^2+1/x^2=11,
(1)x+1/x=±√13
(2) x+1/x/x =
x^2+3x-1=0
x^3+3x^2-x=0
已知x*x+3x-1=0 求(1)x+1/x (2) x+1/x/x
(3)x+1/x/x/x (4)x+1/x/x/x/x
(5) x+1/x/x/x/x/x
解答以下:
∵x*x+3x-1=0
除以x得,x+3-1/x=0整理得 x-1/x=-3平方得.x^2+1/x^2=11,
(1)x+1/x=±√(x+1/x)^2=±√(x^2+2+1/x^2)=±√13,
(2) x+1/x/x 是不是代表 x加上x平方分之一?
以下与此类推?
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