456

а) (х-3у)*(х+3у)-х^ (2)

б)(5m+4n)*(4n-5m)+25m^(2)

в)(5a+6b)^(2)+12b*(5-3b)

г)12n+(2n-3)^(2)

д)(x-2)*(x^(2)+2x+4) -x^(3)

ж)a^(2)-(a-+3)*(a^(2)-3a+9)

с подробным решением пожалуйста!!! 

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