Ответ:
(5а+9b)^2=25a^2+90ab+81b^2
(3x^2-2y)^2=9x^4-12xy+4y^2
(9c-10a)(9c+10a)=9c^2-10a^2
27а^3-48b=(9a^2+12ab+16b^2
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Ответ:
(5а+9b)^2=25a^2+90ab+81b^2
(3x^2-2y)^2=9x^4-12xy+4y^2
(9c-10a)(9c+10a)=9c^2-10a^2
27а^3-48b=(9a^2+12ab+16b^2