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d071202
@d071202
June 2022
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ПОМОГИТЕ ПОЖАЛУЙСТА найдите значение выражения 4a^2-12ab+9b^2-3+6a-9b при а=2,5 b=1 1/3
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1401Tamara
При а=2,5 b=1 1/3
4a^2-12ab+9b^2-3+6a-9b = (2a-3b)^2 - 3 + 3(2a-3b) =
=(2a-3b)(2a-3b+3) -3=
=(2*2,5-3*1 1/3)(2*2,5-3*1 1/3 +3)-3=
= (5 - 4)(5-4+3) -3 =1*4 -3 = 1
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Answers & Comments
4a^2-12ab+9b^2-3+6a-9b = (2a-3b)^2 - 3 + 3(2a-3b) =
=(2a-3b)(2a-3b+3) -3=
=(2*2,5-3*1 1/3)(2*2,5-3*1 1/3 +3)-3=
= (5 - 4)(5-4+3) -3 =1*4 -3 = 1