Toán Lớp 6: Chứng tỏ rằng : A=2+2^2 + 2^3 +……+2^100 chia hết cho 3
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Toán Lớp 6: Chứng tỏ rằng : A=2+2^2 + 2^3 +……+2^100 chia hết cho 3
Comments ( 2 )
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)
vậy A chia hết cho 3