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Bài 1.Tính:C=3^100 -3^99 +3^98-3^97+….+3^2-3+1 Bài 2.Chứng minh rằng:7^6+7^5-7^4 chia hết cho 55 Bài 3.Tìm x, biết: a,x^2=x^5 b,(3y-1)^10=(3y-1)^20
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