Question

2^10+2^11+2^12 chia hết cho 28 

đề bài : chứng minh chia hết 

Answer 1

\(2^{10}+2^{11}+2^{12}=2^8\left(2^2+2^3+2^4\right)=2^8.\left(4+8+16\right)=2^8.28⋮28\left(đpcm\right)\)

Answer 2

\(2^{10}+2^{11}+2^{12}⋮28\\ \Rightarrow2^8+\left(4+8+16\right)\\ \Rightarrow2^8+28\\ \)

\(\)Vì \(28⋮28\\ \Rightarrow2^{10}+2^{11}+2^{12}⋮28.\)

Answer 3

2¹⁰ + 2¹¹ + 2¹² ⋮ 28