[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以4x这题怎么做麻烦拉．．．

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[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以4x这题怎么做麻烦拉．．．
[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以4x
这题怎么做麻烦拉．．．

[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以4x这题怎么做麻烦拉．．．
[(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

[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]/4x
=[(9x²-4y²)-(5x²+8xy-4y²)]/4x
=(4x²-8xy)/4x
=x-2y

[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以4x
=[(9x^2-4y^2)-(5x^2-2xy+10xy-4y^2]/4x
=(4x^2-8xy)/4x
=4x-8y

把上面全部展开：9x平方-4y平方-5x平方+2xy-10xy+4y平方除以4x
然后化简得：4x平方-8xy 除以4x 约去4x得最后结果x-2y

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