Toán Lớp 6: Cho A= 1 + 3 + 3^2 + 3^3 + …….3^101 Chứng minh rằng A chia hết cho 13
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Toán Lớp 6: Cho A= 1 + 3 + 3^2 + 3^3 + …….3^101 Chứng minh rằng A chia hết cho 13
Comments ( 2 )
=(1+3+3^2)+3^3(1+3+3^2)+….+3^99(1+3+3^2)
=13+3^3×13+…+3^99×13
=13×(1+3^3+…+3^99) chia hết cho 13