2,7,28,63,( ),215A.125 B.126 C.127 D.128选哪个?
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已知a满足等式a^2-a-1=0,求代数式a^8+7a^-4的值解:由a^2-a-1=0得,a^2=a+1, 于是a^4=(a+1)^2=a^2+2a+1=3a+2 a^8=(3a+2)^2=9a^2+12a+4=21a+13 a^8+7a^-4=21a+13+7/(3a+2) =(63a^2+81a+26+7)/(3a+2) =(63a+63+81a+33)/(3a+2) =(144a+96)/(3a+2)=48 请
分式计算(a+1/a^2+3a+2)+(a+3/a^2+7a+12)
化简(a+ 3)(a-3) (a-5)(a+7)-2a(a-1)
(a+3)(a-3)+(a-5)(a+7)-2a(a-1)怎么做?
a>0,求a+a^3+a^5+a^7+.a^2n-1
已知a^2+a+1=0,求1+a+a^2+a^3+a^4+a^5+a^6+a^7+a^8的值
已知1+a+a^2=0求1+a+a^2+a^3+a^4+a^5+a^6+a^7+a^8的值在线等
求和:1,a+a^2,a^3+a^4+a^5,a^6+a^7+a^8+a^9,···(a不等于0)
计算:a^2-4/3a+24÷a^3-4a/a^2+7a-8+1/3a
4(a+2)(a+1)-7(a+3)(a-3)+30(a-1)
4(a+2)(a+1)-7(a+3)(a-3)+30(a-1)
因式分解a^3-7a^2-4a+28
(a 1)(a 2)(a 3)(a
(a+2)(a+1)-a(a-3)
-1/2ac+2a*a+ac-2ab-3/5a*a 其中a=5,b=4,c=25a*a-a-4+2a-4a*a,其中a=-11/28p*p-7q -pq=6p-7p*p
因式分解:(a-2)(a-1)+7a
因式分解:(a+1)(a+3)(a+5)(a+7)+15 a(a-b+2)-6b(b+1)(a+1)(a+3)(a+5)(a+7)+15a(a-b+2)-6b(b+1)
(a^2+7a+10)/(a^2-a+1)*(a^4+a)/(a^2+4a+3)/(a^2+a)/(a+2)当a=-1时,化简求值