1.已知a²-a-1=0,求a^8+7a^-4的值2.已知a b满足a²+ab+b²=1,且t=ab-a²-b²,求t的取值范围3.设a+b=1,a²+b²=2,求a^7+b^7的值

1.已知a²-a-1=0,求a^8+7a^-4的值2.已知a b满足a²+ab+b²=1,且t=ab-a²-b²,求t的取值范围3.设a+b=1,a²+b²=2,求a^7+b^7的值
1.已知a²-a-1=0,求a^8+7a^-4的值
2.已知a b满足a²+ab+b²=1,且t=ab-a²-b²,求t的取值范围
3.设a+b=1,a²+b²=2,求a^7+b^7的值

1.已知a²-a-1=0,求a^8+7a^-4的值2.已知a b满足a²+ab+b²=1,且t=ab-a²-b²,求t的取值范围3.设a+b=1,a²+b²=2,求a^7+b^7的值
  a^8+7a^   缺内容     -4
   t=ab-a²-b²=-（a²+ab+b²）=-1