(-3a^2-9a^3b+12a^4b^2)/(-3a^2)= 16(2m-n)^p加2/【-4(2m-n)^p-1】=

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(-3a^2-9a^3b+12a^4b^2)/(-3a^2)=16(2m-n)^p加2/【-4(2m-n)^p-1】=(-3a^2-9a^3b+12a^4b^2)/(-3a^2)=16(2m-n)^p

(-3a^2-9a^3b+12a^4b^2)/(-3a^2)= 16(2m-n)^p加2/【-4(2m-n)^p-1】=
(-3a^2-9a^3b+12a^4b^2)/(-3a^2)= 16(2m-n)^p加2/【-4(2m-n)^p-1】=

(-3a^2-9a^3b+12a^4b^2)/(-3a^2)= 16(2m-n)^p加2/【-4(2m-n)^p-1】=
(-3a^2-9a^3b+12a^4b^2)/(-3a^2)
=1+3ab-4a²b²
16(2m-n)^p加2/【-4(2m-n)^p-1】
=-4(2m-n)^(p+2-p+1)
=-4(2m-n)³