What is five minus two fifths

Five minus two fifths is four and three fifths

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1. If a positive integer can be expressed as the square difference of two positive integers, it is called wisdom number. What is the wisdom number
2. Calculate x ^ n · x ^ n + 1 + x ^ n + 1 · x ^ n + 2 + (- x) ^ 3 · (- x) ^ 2n-4 fast line constant velocity Rt
3. Given the sum of the first n terms of the sequence {an}, Sn = + 2n, TN = 1 / (A1A2) + 1 / (a2a3) + 1 / (a3a4) +... + 1 / (Anan + 1), find TN
4. Given that m ^ 2 = a, m ^ 3 = B, M > 0 and M is not equal to 1, find 2logm a + logm B
5. Two fifths of a pile of coal is exactly 36 tons. How many tons are there in this pile? What is the product of the sum of seven eighths and three fourths multiplied by their difference?
6. If a positive integer can be expressed as the square difference of two positive integers, then the positive integer is called "wisdom number" If a positive integer can be expressed as the square difference of two positive integers, then the positive integer is called "wisdom number". According to your understanding, the following four are not "wisdom number": A2002 B2003 C2004 D2005
7. Calculate the value of (x + 2) (x-1) - 2 (x-3) & sup2; fast bonus! Use complete square formula or square difference formula to solve it!!!! That's the solution! Process, process!
8. It is known that the first term of positive term sequence an is 1, and for any n belongs to N, 1 / A1A2 + 1 / a2a3 + 1 / Anan + 1 = n / a1an + 1, the sum of the first 10 items is 55 Let BN = 1 / Anan + 2, find the first n terms of BN and Sn
9. Let a > 0 and a ≠ 1, M = loga (A3 + 1), n = loga (A2 + 1), then the relation between M and N is () A. M > NB. M < NC. M = nd
10. A number minus the product of 3 / 2 and 2, the difference is 2 / 5, what's the number
11. Given that x2 + y2 = 1, x > 0, Y > 0, and loga (1 + x) = m, loga (11 − x) = n, then=______ ．
12. It is known that the sum of the first n terms of the arithmetic sequence an is Sn, Sn = n ^ 2, sum 1 / (A1A2) + 1 / (a2a3) +. + 1 / [(an-1an] (n ≥ 2) The teacher said, use the split term elimination method to find the complete process,
13. (x + 1) ^ 2 - (2-x) ^ [factorization factor}] 101 ^ 3-101 ^ 2 [calculation by factorization factor]
14. How many square meters is one mu? How many Mu is 132.3 square meters
15. Subtract a quarter of a number from the difference between one ninth and two fifths. What is the number? (solve the equation) Subtract a number from the difference between one ninth and two fifths to get a quarter. What's the number? (solving equations)
16. If the quadratic power of a-ab-12b = 0, and B is not equal to 0, find 2a-b / 2A + B
17. Given the first n terms of sequence an and Sn = 2n ^ 2 + N, the value of LIM [1 / A1A2 + 1 / a2a3 + 1 / a3a4 +... + 1 / Anan + 1] is
18. Let x-n (1.5,4) calculate P {x2.5} Let x-n (1.5,4) compute P {X & lt; = 3.5}, P {X & gt; 2.5} a problem about probability
19. How many square centimeters is one square decimeter? I've been studying for too long. I'm afraid I'll make a mistake,
20. The difference between nine tenths and two fifths subtracts a number to get a quarter. What's the number?