1). (2x-y)^2=4x^2-4xy+y^2; 2). (7m+5n)^2=49m^2+70mn+25n^2; 3). (8c-9b)^2=64c^2-144bc+81b^2.
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2)49m^2+70mn+25n^2
3)64c^2-144cв+81в^2
1). (2x-y)^2=4x^2-4xy+y^2; 2). (7m+5n)^2=49m^2+70mn+25n^2; 3). (8c-9b)^2=64c^2-144bc+81b^2.