Ответ:
(2а-5)^2-(2a-5)(2a+5) = (4a^2-20a+25)-(4a^2-10a+10a-25) = 4a^2-20a+25-4a^2+10a-10a+25 = -20a+50 = -20*1.5+50 = -30+50 = 20
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Ответ:
(2а-5)^2-(2a-5)(2a+5) = (4a^2-20a+25)-(4a^2-10a+10a-25) = 4a^2-20a+25-4a^2+10a-10a+25 = -20a+50 = -20*1.5+50 = -30+50 = 20