Toán Lớp 6: Chứng minh rằng :
a, 2009^2009 – 1 chia hết cho 2008.
b, M= 7+7^3+7^5+7^7+ . . . . + 7^99 chia hết cho 48.
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Toán Lớp 6: Chứng minh rằng :
a, 2009^2009 – 1 chia hết cho 2008.
b, M= 7+7^3+7^5+7^7+ . . . . + 7^99 chia hết cho 48.
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