【(x+2y)(x-2Y)-(x-2y)²】÷4Y,其中x=2,y=½
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【(x+2y)(x-2Y)-(x-2y)²】÷4Y,其中x=2,y=½
![【(x+2y)(x-2Y)-(x-2y)²】÷4Y,其中x=2,y=½](/uploads/image/z/15506792-8-2.jpg?t=%E3%80%90%EF%BC%88x%2B2y%29%EF%BC%88x-2Y%29-%28x-2y%29%26%23178%3B%E3%80%91%C3%B74Y%2C%E5%85%B6%E4%B8%ADx%3D2%2Cy%3D%26%23189%3B)
【(x+2y)(x-2Y)-(x-2y)²】÷4Y
=(x-2y)[(x+2y)-(x-2y)]
=(x-2y)×4y
=(2-2×½﹚×4×½
=1×2
=2
=(x-2y)[(x+2y)-(x-2y)]
=(x-2y)×4y
=(2-2×½﹚×4×½
=1×2
=2
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