x&sup4-x²-6=0

疏远一点2022-10-04 11:39:541条回答

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加重底盘 共回答了27个问题 | 采纳率92.6%
x^4-x²-6=0
(x²-3)(x²+2)=0
∵x²+2不等于0
∴x²-3=0
∴x²=3
∴x=正负根号3
1年前

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已知x²-4x+1=0 ,那么x&sup4-4x²+1/x²的值是;
已知x²-4x+1=0 ,那么x&sup4-4x&sup2+1/x&sup2的值是;
是x²/x&sup4-4x²+1
linxi761年前2
老天给个名字吧 共回答了22个问题 | 采纳率86.4%
x²-4x+1=0
两边除以x得
x+1/x=4
(x^4-4x^2+1)/x^2
=x^1+1/x^2-4
=(x+1/x)2-2-4
=16-6
=10
当x=2007,y=2008时,代数式x&sup4-y&sup4/x²-2xy-y² ÷x²+y
当x=2007,y=2008时,代数式x&sup4-y&sup4/x&sup2-2xy-y&sup2 ÷x&sup2+y&sup2/y-x的值为
当x=2007,y=2008时,代数式 (x的四次方-y的四次方)/(x²-2xy-y²) ÷(x²+y²)/(y-x)的值为
上海标致1年前3
总部1987 共回答了21个问题 | 采纳率95.2%
(x^4-y^4)/(x²-2xy-y²) ÷(x²+y²)/(y-x)
=(x²-y²)(x²+y²)/(x-y)^2÷(x²+y²)/(y-x)
=(x²-y²)*(x²+y²)*(y-x)/(x-y)^2*(x²+y²)
=(x²-y²))/(y-x)
=(x-y)*(x+y)/(y-x)
= --(x+y)
= --x--y
又x=2007,y=2008,所以 (x^4-y^4)/(x²-2xy-y²) ÷(x²+y²)/(y-x)= --x--y= --4015

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