已知x+y=7,xy=2,求:(1):2x的2次方+2y的2次方的值;(2):(x - y)的2次方的值.(1)2x的2次方+2y的2次方=( ) (2)(x - y)的2次方=( )
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![已知x+y=7,xy=2,求:(1):2x的2次方+2y的2次方的值;(2):(x - y)的2次方的值.(1)2x的2次方+2y的2次方=( ) (2)(x - y)的2次方=( )](/uploads/image/z/6918991-7-1.jpg?t=%E5%B7%B2%E7%9F%A5x%2By%3D7%2Cxy%3D2%2C%E6%B1%82%EF%BC%9A%281%29%EF%BC%9A2x%E7%9A%842%E6%AC%A1%E6%96%B9%2B2y%E7%9A%842%E6%AC%A1%E6%96%B9%E7%9A%84%E5%80%BC%EF%BC%9B%282%29%3A%28x+-+y%29%E7%9A%842%E6%AC%A1%E6%96%B9%E7%9A%84%E5%80%BC.%281%292x%E7%9A%842%E6%AC%A1%E6%96%B9%2B2y%E7%9A%842%E6%AC%A1%E6%96%B9%3D%28+%29+%282%29%28x+-+y%29%E7%9A%842%E6%AC%A1%E6%96%B9%3D%28+%29)
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已知x+y=7,xy=2,求:(1):2x的2次方+2y的2次方的值;(2):(x - y)的2次方的值.(1)2x的2次方+2y的2次方=( ) (2)(x - y)的2次方=( )
已知x+y=7,xy=2,求:(1):2x的2次方+2y的2次方的值;(2):(x - y)的2次方的值.
(1)2x的2次方+2y的2次方=( ) (2)(x - y)的2次方=( )
已知x+y=7,xy=2,求:(1):2x的2次方+2y的2次方的值;(2):(x - y)的2次方的值.(1)2x的2次方+2y的2次方=( ) (2)(x - y)的2次方=( )
原式=2﹙x﹢y﹚=2[﹙X﹢Y﹚﹣2XY]=90 原式=﹙X-Y﹚=﹙X﹢Y﹚﹣4XY=41
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