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Giang
2 năm trước
Bài 1 :Cho S=2+$2^{2}$+$2^{3}$+......+$2^{100}$.Chứng minh rằng. a,S chia hết cho 3 b,S chia hết cho 15 Bài 2 :Cho S=5+$5^{2}$+$5^{3}$+......+$5^{99}$+$5^{100}$.Chứng minh rằng. a,S chia hết cho 6 b,S chia hết cho 156 Bài 3:Cho S=3+$3^{3}$+$3^{3}$+......+$3^{190}$.Chứng minh rằng. a,S chia hết cho 4 b,S chia hết cho 10 Bài 4:Cho A=$16^{5}$+$2^{15}$.Chứng minh rằng:S chia hết cho 132 Mong các thần đồng toán học giúp cho.Mình cần gấp lắm
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