Câu hỏi theo thẻ

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phiếu
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Cấp số nhân

a) Bốn số lập thành một cấp số nhân, nếu theo thứ tự ta trừ các số đó đi 2,1,7,27 thì sẽ được bốn số lập thành một cấp số cộng. Tìm bốn số...
1
phiếu
1đáp án
1K lượt xem

Cấp số nhân

Cho ba góc α,β,γ khác π2+kπ(k∈Z). Chứng minh rằng nếu ta có...

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