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tagumitaiga
@tagumitaiga
June 2022
1
25
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.Решите уравнения:
a)(5x-2)(5x+2)=21
b)(2x-3)^2=4x^2-3x
c)(6a+7)^2=(6a-5)(6a+5)-10
d)(3a-4)(3a+4)=9a^2-4a
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СвятойАлексий
А) (5х-2)(5х+2)=2125х²-4=2125х²=21+425х²=25х=±1
2 votes
Thanks 2
tagumitaiga
А остальные???
СвятойАлексий
б)4х²-12х+9-4х²+3х=0; -9х+9=0; х=1
СвятойАлексий
в)36а²+84а+49-36а²+25+10=0; 84а=-84; а=-1
СвятойАлексий
г)9а²-16-9а²-4а=0; -4а=16; а=-2
tagumitaiga
спасибо
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