Ответ:
(x+y)^2=x^2+2xy+y^2
a^2+2at+t^2
x^2+4x+4
b^2+18b+9
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Ответ:
(x+y)^2=x^2+2xy+y^2
a^2+2at+t^2
x^2+4x+4
b^2+18b+9