разложите на множители:
1/2 a^(2) + ab + 1/2 b^(2)
1/2 a^2 + ab + 1/2 b^2 = 1/2(a^2+2ab+b^2)= 1/2(a+b)^2
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1/2 a^2 + ab + 1/2 b^2 = 1/2(a^2+2ab+b^2)= 1/2(a+b)^2