Tìm x thuộc Z để A thuộc Z
----- Nội dung ảnh -----
**ĐỀ THI**
1. a) \( A = 1 + 1 + 1 + \ldots + 1 \)
b) \( B = 2^2 + 2^2 + 2^2 \) \= 19.21
c) \( A = 5 + 4 + 3 + \ldots + 1B \)
d) \( 2^3 + 2^{10} \)
e) \( 13.27 - 14.26 \)
f) \( A = 2^{35} + 2^{36} \)
g) \( A = 5 + 5 + 5^3 + \ldots + 5^{2024} \)
h) \( A = 3 - 3^2 + 3^3 - \ldots - 3^{100} \)
2. **CMR**
a) \( A = 6^{24} + 6^{22} + 6^{23} + \ldots + 6^{20} = 7 \)
b) \( B = 1 + 5^2 + 5^3 + 5^4 + \ldots + 5^{36} = 31 \)
3. Tìm \( x \in \mathbb{Z} \) sao cho \( AE \in \mathbb{Z} \)
a) \( A = 3 \)
b) \( B = 2x + 4 \)
\( x + 1 \)
**ĐỀ THI**
1. a) \( A = 1 + 1 + 1 + \ldots + 1 \)
b) \( B = 2^2 + 2^2 + 2^2 \) \= 19.21
c) \( A = 5 + 4 + 3 + \ldots + 1B \)
d) \( 2^3 + 2^{10} \)
e) \( 13.27 - 14.26 \)
f) \( A = 2^{35} + 2^{36} \)
g) \( A = 5 + 5 + 5^3 + \ldots + 5^{2024} \)
h) \( A = 3 - 3^2 + 3^3 - \ldots - 3^{100} \)
2. **CMR**
a) \( A = 6^{24} + 6^{22} + 6^{23} + \ldots + 6^{20} = 7 \)
b) \( B = 1 + 5^2 + 5^3 + 5^4 + \ldots + 5^{36} = 31 \)
3. Tìm \( x \in \mathbb{Z} \) sao cho \( AE \in \mathbb{Z} \)
a) \( A = 3 \)
b) \( B = 2x + 4 \)
\( x + 1 \)