Question

Помогите с заданием, сделайте только 2,4,6!!!!​

Answer 1

$\boxed{a^2-2ab+b^2=(a-b)^2\;,\;a^2+2ab+b^2=(a+b)^2}\\\\\\2)~25t^2+30t+9=5^2t^2+2\cdot5t\cdot3+3^2=\\\\=(5t)^2+2\cdot5t\cdot3+3^2=\boxed{(5t+3)^2}\;;\\\\4)~121a^2-44ac+4c^2=11^2a^2-2\cdot11a\cdot2c+2^2c^2=\\\\=(11a)^2-2\cdot11a\cdot2c+(2c)^2=\boxed{(11a-2c)^2}\;;\\\\6)~36t^2-84ts+49s^2=6^2t^2-2\cdot6t\cdot7s+7^2s^2=\\\\=(6t)^2-2\cdot6t\cdot7s+(7s)^2=\boxed{(6t-7s)^2}\;.$