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michail228
@michail228
August 2022
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90-92 пожалуйста на листочкн
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DariosI
Verified answer
90.
ОДЗ
х=6
х=-6
х=3
(8x+42)(x-6)=5(x²-3x+6x-18)
8x²+42x-48x-252=5(x²+3x-18)
8x²-6x-252=5x²+15x-90
3x²-21x-162=0
x²-7x-54=0
D=49+4*54=265
x₁₂=(7+-√265)/2
91
ОДЗ
х=1
х=3
6+13x-7x²-39+7x=3x-9
-7x²+20x-33=3x-9
7x²-17x+24=0
D=17*17-4*7*24=-383 корней нет
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michail228
а 92?
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Answers & Comments
Verified answer
90.ОДЗ
х=6
х=-6
х=3
(8x+42)(x-6)=5(x²-3x+6x-18)
8x²+42x-48x-252=5(x²+3x-18)
8x²-6x-252=5x²+15x-90
3x²-21x-162=0
x²-7x-54=0
D=49+4*54=265
x₁₂=(7+-√265)/2
91
ОДЗ
х=1
х=3
6+13x-7x²-39+7x=3x-9
-7x²+20x-33=3x-9
7x²-17x+24=0
D=17*17-4*7*24=-383 корней нет