1) (2а+3)2 = 4а2+7а+9
2)(3х-2у)2=9х2-12ху+4у2
3)(4b+3c)2=16b2+24bc+9c2
4)(5x-3y)2=25x2-30xy+9y2
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2) 9х^2 - 12ху + 4у^2
3) 16b^2 + 24bc + 9c^2
4) 25x^2 - 30xy + 9y^2
просто приводим к формуле
1) (2а+3)2 = 4а2+7а+9
2)(3х-2у)2=9х2-12ху+4у2
3)(4b+3c)2=16b2+24bc+9c2
4)(5x-3y)2=25x2-30xy+9y2