1、若(a+b)²=5,(a-b)²=1,求a²+b²和ab的值.2、计算 19 2/3*20 1/3 3、化简:(a+1)(a-1)(a²+1)(a^4 +1)(a^8 +1)...(a^256 +1) 4、若x+y=a,xy=b,求x²+y²,x的四次方加y的四次方的值
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![1、若(a+b)²=5,(a-b)²=1,求a²+b²和ab的值.2、计算 19 2/3*20 1/3 3、化简:(a+1)(a-1)(a²+1)(a^4 +1)(a^8 +1)...(a^256 +1) 4、若x+y=a,xy=b,求x²+y²,x的四次方加y的四次方的值](/uploads/image/z/14570098-34-8.jpg?t=1%E3%80%81%E8%8B%A5%EF%BC%88a%2Bb%EF%BC%89%26%23178%3B%3D5%2C%EF%BC%88a-b%EF%BC%89%26%23178%3B%3D1%2C%E6%B1%82a%26%23178%3B%2Bb%26%23178%3B%E5%92%8Cab%E7%9A%84%E5%80%BC.2%E3%80%81%E8%AE%A1%E7%AE%97+19+2%2F3%2A20+1%2F3+3%E3%80%81%E5%8C%96%E7%AE%80%EF%BC%9A%EF%BC%88a%2B1%EF%BC%89%EF%BC%88a-1%EF%BC%89%EF%BC%88a%26%23178%3B%2B1%EF%BC%89%EF%BC%88a%5E4+%2B1%EF%BC%89%28a%5E8+%2B1%29...%28a%5E256+%2B1%29+4%E3%80%81%E8%8B%A5x%2By%3Da%2Cxy%3Db%2C%E6%B1%82x%26%23178%3B%2By%26%23178%3B%2Cx%E7%9A%84%E5%9B%9B%E6%AC%A1%E6%96%B9%E5%8A%A0y%E7%9A%84%E5%9B%9B%E6%AC%A1%E6%96%B9%E7%9A%84%E5%80%BC)
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