a, 5 mũ 5 / 5 mũ x = 5 mũ 3 b, 3 mũ 2x + 3 / 9 mũ 3 = 9 mũ 14 Tìm x nha 25/07/2021 Bởi Eden a, 5 mũ 5 / 5 mũ x = 5 mũ 3 b, 3 mũ 2x + 3 / 9 mũ 3 = 9 mũ 14 Tìm x nha
$\dfrac{5^5}{5^x}=5^3$ x=5-3 x=2 $\dfrac{3^{2x+3}}{(3^3)^2}=(3^2)^{14}$ `3^{2x+3}=3^28` `2x-3=28` `2x=31` `x=31/2` Bình luận
Đáp án: `a)` ` (5^5)/(5^x) = 5^3` `=> 5^(5-x) = 5^3` ` => 5 – x = 3` ` => x= 2` ***** `b)` ` (3^(2x + 3))/(9^3) = 9^(14)` ` (3^(2x+3))/(3^2)^3 = (3^2)^(14)` ` (3^(2x+3))/(3^6) = 3^(28)` ` 3^(2x+3-6) = 3^(28)` ` 3^(2x-3)= 3^(28)` ` 2x -3 = 28` ` => 2x = 31` ` => x = 31/2` Bình luận
$\dfrac{5^5}{5^x}=5^3$
x=5-3
x=2
$\dfrac{3^{2x+3}}{(3^3)^2}=(3^2)^{14}$
`3^{2x+3}=3^28`
`2x-3=28`
`2x=31`
`x=31/2`
Đáp án:
`a)`
` (5^5)/(5^x) = 5^3`
`=> 5^(5-x) = 5^3`
` => 5 – x = 3`
` => x= 2`
*****
`b)`
` (3^(2x + 3))/(9^3) = 9^(14)`
` (3^(2x+3))/(3^2)^3 = (3^2)^(14)`
` (3^(2x+3))/(3^6) = 3^(28)`
` 3^(2x+3-6) = 3^(28)`
` 3^(2x-3)= 3^(28)`
` 2x -3 = 28`
` => 2x = 31`
` => x = 31/2`