1) а^2+4аb+b^2-(a+b)^2 = а^2+4аb+b^2-(a^2+2ab+b^2) = а^2+4аb+b^2-a^2-2ab+b^2 = 2 ab
2) 5a^2+12a+9-(2a+3)^2 = 5a^2+12a+9-(4a^2+12a+9) = 5a^2+12a+9-4a^2-12a-9 = a^2
3) 2ab-(-a^2-4ab-9b^2) = 2ab+a^2+4ab+9b^2 = 6ab+a^2+9b^2
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1) а^2+4аb+b^2-(a+b)^2 = а^2+4аb+b^2-(a^2+2ab+b^2) = а^2+4аb+b^2-a^2-2ab+b^2 = 2 ab
2) 5a^2+12a+9-(2a+3)^2 = 5a^2+12a+9-(4a^2+12a+9) = 5a^2+12a+9-4a^2-12a-9 = a^2
3) 2ab-(-a^2-4ab-9b^2) = 2ab+a^2+4ab+9b^2 = 6ab+a^2+9b^2