（24m^3n-16m^2n^2+mn^3)除（-8m）第二题[(3x+2y)(3x-2y)-(x+2y)(5x-2y)

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（24m^3n-16m^2n^2+mn^3)除（-8m）第二题[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除4x

(24m³n-16m²n²+mn³)÷(-8m)
=[-8m(-3m²n+2mn²-8分之n³)]÷(-8m)
=-3m²n+2mn²-8分之n³
[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]÷4x
=[(9x²-4y²)-(5x²+8xy-4y²)]÷4x
=(4x²-8xy)÷4x
=[4x(x-2y)]÷4x
=x-2y
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