u_3 = 1/2, u_6 = 1/16
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tìm số hạng đầu và công bội của cấp số nhân
- u_2 = 3, u_5 = 81
- u_1 + u_2 = 20, u_3 + u_4 = 80
- u_2 = 3/√2, u_4 = 9√2
- u_4 = 32, u_6 = 128
- 34. Cấp số nhân (u_n) có u_1 + u_2 = 15 và u_3 + u_4 = 60. Tìm u_1 và q.
- u_1 * u_6 = 1/64, u_2 * u_5 = 1/64
- u_2 = -8, u_5 = -512
- u_1 * u_5 = 81/625, u_3 = 9/25
- u_3 = 1/12, u_6 = 1/96
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