1.已知x2+y2+z2-2x+4y-6z+14=0,求x+y+z的值.2.当3a2+ab-2b2=0(a≠0,且b≠0)时,求a/b-b/a-(a2+b2)/ab的值.3.(1)已知x+y=10,x3+y3=100,求x2+y2的值;(2)已知a-b=3,求a3-b3-9ab的值.
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![1.已知x2+y2+z2-2x+4y-6z+14=0,求x+y+z的值.2.当3a2+ab-2b2=0(a≠0,且b≠0)时,求a/b-b/a-(a2+b2)/ab的值.3.(1)已知x+y=10,x3+y3=100,求x2+y2的值;(2)已知a-b=3,求a3-b3-9ab的值.](/uploads/image/z/1853310-30-0.jpg?t=1.%E5%B7%B2%E7%9F%A5x2%2By2%2Bz2-2x%2B4y-6z%2B14%3D0%2C%E6%B1%82x%2By%2Bz%E7%9A%84%E5%80%BC.2.%E5%BD%933a2%2Bab-2b2%3D0%28a%E2%89%A00%2C%E4%B8%94b%E2%89%A00%29%E6%97%B6%2C%E6%B1%82a%2Fb-b%2Fa-%28a2%2Bb2%29%2Fab%E7%9A%84%E5%80%BC.3.%EF%BC%881%EF%BC%89%E5%B7%B2%E7%9F%A5x%2By%3D10%2Cx3%2By3%3D100%2C%E6%B1%82x2%2By2%E7%9A%84%E5%80%BC%EF%BC%9B%EF%BC%882%EF%BC%89%E5%B7%B2%E7%9F%A5a-b%3D3%2C%E6%B1%82a3-b3-9ab%E7%9A%84%E5%80%BC.)
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