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解∵x+1/x=3∴(x+1/x)²;=3²;x²;+ 2 + 1/x²;=9x²;+ 1/x²;=7(x²;+ 1/x²;)²;=7²;x^4 + 1/ x^4 =47x^3+x-3=(x + 1/x)(x²;-1 +1/x²;)=3×(7-1)=18(x^3+x-3+7)÷(x^4+x^-…
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