已知x+1/x=6 (1)求x^2+1/x^2的值 (2)求(x-1/x)^2的值
3个回答
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x+1/x=6
(1)(x+1/x)^2=x^2+1/x^2+2=36
所以x^2+1/x^2=34
(2)x^2+1/x^2=x^2+1/x^2-2
=34-2
=32
(1)(x+1/x)^2=x^2+1/x^2+2=36
所以x^2+1/x^2=34
(2)x^2+1/x^2=x^2+1/x^2-2
=34-2
=32
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x^2+1/x^2
=(x+1/x)^2-2
=6^2-2
=34
(x-1/x)^2
=(x+1/x)^2-4
=6^2-4
=32
=(x+1/x)^2-2
=6^2-2
=34
(x-1/x)^2
=(x+1/x)^2-4
=6^2-4
=32
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展开全部
x+1/x=6
(1)
x^2+1/x^2
=(x+1/x)²-2
=36-2
=34
(2)
(x-1/x)^2
=x²+1/x²-2
=34-2
=32
(1)
x^2+1/x^2
=(x+1/x)²-2
=36-2
=34
(2)
(x-1/x)^2
=x²+1/x²-2
=34-2
=32
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