Відомо, що 2a^2b^3=9. знайдіть значення виразу: 2a^4b^6. ! 50 !

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tatarinova-51

22.10.2022

$2a^{2}b^{3} =9\\\\a^{2}b^{3}=4,5\\\\a^{4}b^{6}=(a^{2}b^{3})^{2}=4,5^{2}=20,25\\\\2a^{4}b^{6} =2*20,25=40,5\\\\Otvet:\boxed{40,5}$

cleopatra1959

22.10.2022

1)
x+4y=9 |*(-2) => -2x-8y=-18 => x=3
3x+8y=21 |*1 => 3x+8y=21 => y=1,5
Сложив уравнения, получим х=3
ответ: (3; 1,5)
2)
3x+y=264 |*5 => 15x+5y=1320 => x=80
2x-5y=40 |*1 => 2x-5y=40 => y=24
Сложив уравнения, получим 17х=1360 => x=80
ответ: (80; 24)
3) Умножим второе уравнение на 10
x+y=4100 |*(-8) => -8x-8y= -32800 => x=2800
8x+11y=36700 |*1 => 8x+11y=36700 => y=1300
Сложив уравнения, получим 3y=3900 => y=1300
ответ: (2800; 1300)

dimoni86

22.10.2022

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