Toán Lớp 7: TÍnh tổng cơ số:
1+2. 6+3.$6^{2}$ +4.$6^{3}$ +…+100.$6^{99}$
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Toán Lớp 7: TÍnh tổng cơ số:
1+2. 6+3.$6^{2}$ +4.$6^{3}$ +…+100.$6^{99}$
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