Ответ:
4x^2+4x+1=(2x+1)^2=(2*19.5+1)^2=(39+1)^2=40^2=1600
Объяснение:
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Ответ:
4x^2+4x+1=(2x+1)^2=(2*19.5+1)^2=(39+1)^2=40^2=1600
Объяснение: