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\( (-11).77 - 23.11 + (-29) \)
\(=11.(-77)-23.11+(-29)\)
\(=11.[(-77)-23]+(-29)\)
\(=11.(-100)+(-29)\)
= -1100 + (-29)
= -(1100+29)=-1071
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\(\dfrac{1}{2}A=\dfrac{1}{2}+\left(\dfrac{1}{2}\right)^2+\left(\dfrac{1}{2}\right)^3+\left(\dfrac{1}{2}\right)^4+...+\left(\dfrac{1}{2}\right)^{2023}\)
\(A-\dfrac{1}{2}A=\left(\dfrac{1}{2}\right)^{2023}-1\)
\(\dfrac{1}{2}A=\left(\dfrac{1}{2}\right)^{2023}-1\)
\(A=\dfrac{1}{2^{2022}}-2\)
12A=12+(12)2+(12)3+(12)4+...+(12)202312A=12+(12)2+(12)3+(12)4+...+(12)2023
A−12A=(12)2023−1A−12A=(12)2023−1
12A=(12)2023−112A=(12)2023−1
A=122022−2
![](https://rs.olm.vn/images/avt/0.png?1311)
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`(5-6x) = +-7^2`
`=> 5 - 6x = 7 => 6x = -2 => x = -1/3`
`5 - 6x = -7 => 6x = 12 => x = 2`
Vậy `x = -1/3, 2`.
Giups mik vs ai có câu trl mik sẽ tick cho ạ!
Bài 3:
a: a=140
b: a=270