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dimakononon
@dimakononon
July 2022
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помогите решить задание номер 382 буквы а и б
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IrkaShevko
Verified answer
А) 7x² - 36x + 5 - 12x² -8x + 4 > 0
5x² + 44x - 9 < 0
D = 1936 + 180 = 2116 = 46²
x1 = (-44 - 46)/10 = -9
x2 = (-44 + 46)/10 = 0,2
x∈(-9; 0,2) наименьшее целое: -8
б) 5x² + 10x + 2 + 2x - 4x² < 0
x² + 12x + 2 < 0
D = 144 - 8 = 136
x1 = 6 - √34 ≈0,169
x2 = 6 + √34
x∈(6 - √34; 6 + √34) наименьшее целое: 1
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dimakononon
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Answers & Comments
Verified answer
А) 7x² - 36x + 5 - 12x² -8x + 4 > 05x² + 44x - 9 < 0
D = 1936 + 180 = 2116 = 46²
x1 = (-44 - 46)/10 = -9
x2 = (-44 + 46)/10 = 0,2
x∈(-9; 0,2) наименьшее целое: -8
б) 5x² + 10x + 2 + 2x - 4x² < 0
x² + 12x + 2 < 0
D = 144 - 8 = 136
x1 = 6 - √34 ≈0,169
x2 = 6 + √34
x∈(6 - √34; 6 + √34) наименьшее целое: 1