已知(a+b)²=1.(a-b)²=25.求a²+ab+b²
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已知(a+b)²=1.(a-b)²=25.求a²+ab+b²
已知(a+b)²=1.(a-b)²=25.求a²+ab+b²
已知(a+b)²=1.(a-b)²=25.求a²+ab+b²
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