Toán Lớp 6: Cho A=2+2^2+2^3+2^4+…….+2^100. Chứng minh A chia hết cho 3
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Toán Lớp 6: Cho A=2+2^2+2^3+2^4+…….+2^100. Chứng minh A chia hết cho 3
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A=(2+2^2)+(2^3+2^4)+………………………..+(2^99+2^100)
A=2.(1+2)+2^3.(1+2)+…………………………+2^99.(1+2)
A=2.3+2^3. 3+…………………+2^99. 3
A=3.(2+2^3+………………+2^99)
Vì 3vdots3
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