There are four real numbers. The first three numbers form an equal ratio sequence, and their product is - 64. The last three numbers form an equal difference sequence, and their product is - 640 Find these four numbers, find the detailed process

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• 1. It is known that the first three numbers of four positive real numbers are equal difference sequence, the last three numbers are equal ratio sequence, the sum of the first and the third is 8, and the product of the second and the fourth is 36 (II) if the first three numbers are the first three terms of the arithmetic sequence an and the last three numbers are the first three terms of the proportional sequence BN, let CN= an.bn To find the first n terms and TN of the sequence CN
• 2. 3x + 1 / 4 = 3 / 5 solution equation
• 3. The solution equation: (40-0.8x) &# 178; + (30-0.5x) &# 178; = 16 & # 178;
• 4. There are four real numbers. The product of the first three arithmetical sequences is 216, and the sum of the last three arithmetical sequences is 24
• 5. How many 5-digit numbers can 123456 be composed of
• 6. Let the square of the process (the square root of 2 + 2) = a + B times the square root of 2, a + B= a. B is a rational number
• 7. If the equation x ^ 2 + MX + 1 = 0 of X has two unequal real roots, the value range of real number m is as follows: A. (- 1,1) B, (- 2,2) C, (negative infinity, - 2) ∪ (2, positive infinity) d, (negative infinity, - 1) ∪ (1, positive infinity)
• 8. How to solve equation 0.2 times 8 plus 0.4x equals 18?
• 9. Solution equation: 8x-2.8 = 40-x
• 10. There are four real numbers. The first three numbers form an equal ratio sequence, and their product is - 8. The last three numbers form an equal difference sequence, and their product is - 80
• 11. There are four real numbers. The first three are in equal proportion sequence, and their product is 216. The last three are in equal difference sequence, and their sum is 12 Set up four unknowns!
• 12. Three unequal real numbers form an equal difference sequence, and then form an equal ratio sequence after proper exchange of positions, so as to find the common ratio of the equal ratio sequence
• 13. Three unequal real numbers form an arithmetic sequence. After properly exchanging the positions of the three numbers, they become an arithmetic sequence. Then the common ratio of the arithmetic sequence is___ ．
• 14. Three real numbers that are not equal to each other form an arithmetic sequence. If these three numbers are properly arranged, they can become an equal ratio sequence, and the sum of these three numbers is 6, then these three numbers can be calculated
• 15. The sequence {an} is an equal ratio sequence, m, N, P are equal difference sequence, if am = 4, an = 6, then the value of AP is equal
• 16. It is known that the fine brushwork Q of equal ratio sequence is not equal to 1, and am, an and AP are equal ratio sequence. It is proved that m, N and P are equal difference sequence
• 17. In the equal ratio sequence {an}, the sum of the first n terms is SN. If SM, SM + 2, SM + 1 are equal difference sequence, then am, am + 2, am + 1 are equal difference sequence. (1) write the inverse proposition of this proposition; (2) judge whether the inverse proposition is true? The proof is given
• 18. It is known that SM and Sn respectively represent the sum of the first m terms and the first n terms of the arithmetic sequence {an}, and smsn = m2n2, then aman=______ ．
• 19. Given that the sum of the first n terms of two arithmetic sequences {an} and {BN} is an and BN respectively, and anbn = 7n + 45N + 3, then the number of positive integers n with anbn as an integer is () A. 2B. 3C. 4D. 5
• 20. Given that the sum of the first n terms of two arithmetic sequences {an} and {BN} is an and BN respectively, and anbn = 7n + 45N + 3, then the number of positive integers n with anbn as an integer is () A. 2B. 3C. 4D. 5