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Алина041111
@Алина041111
July 2022
1
6
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помогите с Алгеброй 8 класс.Нужно избавиться от ирроциональности в знаменителе( "/"-это дробь)
1)15/√3
2)7/3-√2
3)11/2√5+3
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Answers & Comments
27Urij27
1) 15/√3 = 15√3/3 = 5√3;
2) 7/3-√2 = 7(3+√2)/(3-√2)(3+√2) = 7(3+√2)/9-2 = 3+√2;
3) 11/2√5+3 = 11(2√5-3)/(2√5+3)(2√5-3) = 11(2√5-3)/4×5-9 = 11(2√5-3)/11 = 2√5-3.
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Answers & Comments
2) 7/3-√2 = 7(3+√2)/(3-√2)(3+√2) = 7(3+√2)/9-2 = 3+√2;
3) 11/2√5+3 = 11(2√5-3)/(2√5+3)(2√5-3) = 11(2√5-3)/4×5-9 = 11(2√5-3)/11 = 2√5-3.