已知实数a,b满足a+b=8,ab=15,且a>b,试求a-b的值 解a+b=8,ab=15 (a+b)平方=a方+2ab+b方=64已知实数a,b满足a+b=8,ab=15,且a>b,试求a-b的值解a+b=8,ab=15 (a+b)平方=a方+2ab+b方=64a方+b方=34,(a-b)方=a方-2ab+b方=34-2*
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![已知实数a,b满足a+b=8,ab=15,且a>b,试求a-b的值 解a+b=8,ab=15 (a+b)平方=a方+2ab+b方=64已知实数a,b满足a+b=8,ab=15,且a>b,试求a-b的值解a+b=8,ab=15 (a+b)平方=a方+2ab+b方=64a方+b方=34,(a-b)方=a方-2ab+b方=34-2*](/uploads/image/z/1812333-21-3.jpg?t=%E5%B7%B2%E7%9F%A5%E5%AE%9E%E6%95%B0a%2Cb%E6%BB%A1%E8%B6%B3a%2Bb%3D8%2Cab%3D15%2C%E4%B8%94a%3Eb%2C%E8%AF%95%E6%B1%82a-b%E7%9A%84%E5%80%BC+%E8%A7%A3a%2Bb%3D8%2Cab%3D15+%EF%BC%88a%2Bb%EF%BC%89%E5%B9%B3%E6%96%B9%3Da%E6%96%B9%2B2ab%2Bb%E6%96%B9%3D64%E5%B7%B2%E7%9F%A5%E5%AE%9E%E6%95%B0a%2Cb%E6%BB%A1%E8%B6%B3a%2Bb%3D8%2Cab%3D15%2C%E4%B8%94a%3Eb%2C%E8%AF%95%E6%B1%82a-b%E7%9A%84%E5%80%BC%E8%A7%A3a%2Bb%3D8%2Cab%3D15+%EF%BC%88a%2Bb%EF%BC%89%E5%B9%B3%E6%96%B9%3Da%E6%96%B9%2B2ab%2Bb%E6%96%B9%3D64a%E6%96%B9%2Bb%E6%96%B9%3D34%2C%EF%BC%88a-b%EF%BC%89%E6%96%B9%3Da%E6%96%B9-2ab%2Bb%E6%96%B9%3D34-2%2A)
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