已知(x+y)^2=7,(x-y)^2=3,求(1)x^2=y^2 (2)x^4=y^4的值 (3)x^6=y^6
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![已知(x+y)^2=7,(x-y)^2=3,求(1)x^2=y^2 (2)x^4=y^4的值 (3)x^6=y^6](/uploads/image/z/7170012-36-2.jpg?t=%E5%B7%B2%E7%9F%A5%28x%2By%29%5E2%3D7%2C%28x-y%29%5E2%3D3%2C%E6%B1%82%EF%BC%881%EF%BC%89x%5E2%3Dy%5E2+%EF%BC%882%EF%BC%89x%5E4%3Dy%5E4%E7%9A%84%E5%80%BC+%EF%BC%883%EF%BC%89x%5E6%3Dy%5E6)
已知(x+y)^2=7,(x-y)^2=3,求(1)x^2=y^2 (2)x^4=y^4的值 (3)x^6=y^6
已知(x+y)^2=7,(x-y)^2=3,求(1)x^2=y^2 (2)x^4=y^4的值 (3)x^6=y^6
已知(x+y)^2=7,(x-y)^2=3,求(1)x^2=y^2 (2)x^4=y^4的值 (3)x^6=y^6
已知(x+y)^2=7,(x-y)^2=3,求(1) x^2+y^2 (2)x^4+y^4的值 (3)x^6+y^6
题目都打错了你
两式相加除以2的x^2+y^2=5,两式相减法除以2的xy=1
x^2+y^2=5两边平方得x^4+y^4+2xyxy=25 ,x^4+y^4=23
(x^2+y^2)(x^4+y^4)=23*5=115
x^6+y^6+xxyy(x^2+y^2)=115 ,x^6+y^6=110
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