已知ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406,求2008(x+y)+2008xy+(a+b)/21的值

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2(ax+by-ax)-(ax+by)^2-(by-ax)^2 其中a=-3 b=0.52(ax+by)(by-ax)-(ax+by)^2-(by-ax)^2 已知ax+by=7 ax²+by²=49 ax³+by³=133 ax^4+by^4=406已知ax+by=7 ax²+by²=49 ax³+by³=133 ax^4+by^4=406(1)求a+b ,x+y,xy的值(2)请问ax^5+by^5的值是有理数吗?(2)请问ax^5+by^5的值是有理数吗? 2(ax+by)*(by-ax)-(ax+by)²-(by-ax)²,其中a=-3,x=2分之1 已知方程组{ax+3by=c,2ax-by=5c ax+bx=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,求ax^5+bx^5. ax+bx=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,求ax^5+bx^5. 已知ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406.求:2001(x+y)+6xy-17/2(a+b)的值 已知ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406,求2008(x+y)+2008xy+(a+b)/21的值 已知ax+by=7,ax^2+by^2=49,ax^3+by^3=133,ax^4+by^4=406.求:2008(x+y)+2008xy+(a+b)/21 已知ax+by=7,ax+by=49,ax+by=133,ax四次方+by四次方=406.则2003(x+y)+6xy-2/17(a+b)的值为________? 已知ax+by=7ax^2+by^2=49ax^3+by^3=133ax^4+by^4=406试求1995(x+y)+6xy-17/2(a+b)的值过程要详细已知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 实数a,b,x,满足ax+by=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,ax^5+by^5=? 若a,b,x,y满足ax+by=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,求ax^5+by^5的值 若a,b,x,y满足ax+by=3,ax^2+by^2=7,ax^3+by^3=16,ax^4+by^4=42,求ax^5+by^5的值 2(ax+by)*(by-ax)-(ax-by)^2-(by-ax)^2,其中a=-3,b=1/2 (先化简,再求值) 求代数式2(ax+by)(by-ax)-(ax+by)²-(ax-by)²的值,其中a=-4,a-x=-1. xoy平面上,ax+by=c,ax+by>c,ax+by》c,ax+by 已知ax+by=3,ax²+by²=7,ax²+by³=16,ax^4+by^4=42,求ax^5+by^5的值