x^2+1/x^2=7,x+1/x等于
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x^2+1/x^2=7,x+1/x等于
x^2+1/x^2=7,x+1/x等于
x^2+1/x^2=7,x+1/x等于
(x+1/x)²
=x²+2+1/x²
=7+2
=9
所以x+1/x=±3
(x-1)(x-2)(x-3)(x-4)=(x+5)(x+6)(x+7)求X等于几?
2/x-x+1/x=1 X等于多少
*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X ||
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