:设ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406试求:1995(x+y)+6xy-(17/2)(a+b)的值

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:设ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406试求:1995(x+y)+6xy-(17/2)(a+b)的值
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:设ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406试求:1995(x+y)+6xy-(17/2)(a+b)的值
:设ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406试求:1995(x+y)+6xy-(17/2)(a+b)的值

:设ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406试求:1995(x+y)+6xy-(17/2)(a+b)的值
额,你给的数字有点难算