[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以4x
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[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以4x
这题怎么做麻烦拉...
这题怎么做麻烦拉...
![[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以4x](/uploads/image/z/9859269-21-9.jpg?t=%5B%283x%2B2y%29%283x-2y%29-%28x%2B2y%29%285x-2y%29%5D%E9%99%A4%E4%BB%A54x)
[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]/4x
=[(9x^2-4y^2)-(5x^2+8xy-4y^2)]/4x
=(9x^2-4y^2-5x^2-8xy+4y^2)/4x
=(4x^2-8xy)/4x
=x-2y
=[(9x^2-4y^2)-(5x^2+8xy-4y^2)]/4x
=(9x^2-4y^2-5x^2-8xy+4y^2)/4x
=(4x^2-8xy)/4x
=x-2y
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
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