1.已知实数a,b满足(a+b)的2次方=1,(a-b)的2次方=25,求a的2次方+b的2次方+ab的值得多少2.计算(x-y+1)(x+y-5)帮下忙了~
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![1.已知实数a,b满足(a+b)的2次方=1,(a-b)的2次方=25,求a的2次方+b的2次方+ab的值得多少2.计算(x-y+1)(x+y-5)帮下忙了~](/uploads/image/z/5401893-21-3.jpg?t=1.%E5%B7%B2%E7%9F%A5%E5%AE%9E%E6%95%B0a%2Cb%E6%BB%A1%E8%B6%B3%EF%BC%88a%2Bb%EF%BC%89%E7%9A%842%E6%AC%A1%E6%96%B9%3D1%2C%EF%BC%88a-b%29%E7%9A%842%E6%AC%A1%E6%96%B9%3D25%2C%E6%B1%82a%E7%9A%842%E6%AC%A1%E6%96%B9%2Bb%E7%9A%842%E6%AC%A1%E6%96%B9%2Bab%E7%9A%84%E5%80%BC%E5%BE%97%E5%A4%9A%E5%B0%912.%E8%AE%A1%E7%AE%97%28x-y%2B1%29%28x%2By-5%29%E5%B8%AE%E4%B8%8B%E5%BF%99%E4%BA%86%7E)
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