Toán Lớp 6: Cho S =1+3+3^2+3^3+3^4+3^5+3^6+3^7+3^8+3^9. Chứng tỏ rằng S chia hết cho 4.
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Toán Lớp 6: Cho S =1+3+3^2+3^3+3^4+3^5+3^6+3^7+3^8+3^9. Chứng tỏ rằng S chia hết cho 4.
Comments ( 2 )
S=4+9+27+81+243+729+2187+6561+19683
=29524
=>29524÷4=7381
Vậy S chia hết cho 4