There is a problem in probability and Statistics: let the density function of random variable X be f (x) = {(3x ^ 2) / 8,0

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• 1. It is easy to calculate if you can 1.37.3-1.5/0.24=? 2.0.8x（20-1.25）=? 3.78/0.25/0.4=? Special reminder is out of formula calculation!
• 2. 5 / 7 + 1 / 4-5 / 7
• 3. If the height of a cylindrical bucket is changed to twice the original height and the bottom diameter is changed to half the original diameter, it can hold 40 kg of water, then the original bucket can hold water______ Kilogram
• 4. We need the formula! There is a batch of rice in the canteen. After eating one third of the rice, they bought 35 bags. The rice in the canteen is one fourth more than before. How many bags of rice are there in the canteen?
• 5. Ask a math question, the question is like this. 90.2 △ 75.1, find the quotient to you and check! Find the formula! I think it's our usual algorithm, which is used to eliminate the decimal point of the number! It's 75.1 △ 90.2
• 6. Simple calculation 90.909-9.09 + 90.9
• 7. The law calculation of 1 / 12 + 1 / 20 + 1 / 30 + 1 / 42 + 1 / 56
• 8. Formula calculation: 42 is 1 / 6 more than bracket
• 9. 1 / 2, 1 / 6, 1 / 12, 1 / 20, 1 / 30, 1 / 42. According to the law, the seventh number is. The nth number is. 1 / 132 is the number
• 10. 1/2,1/6,1/12,1/30,1/42…… Find the rule, the nth number is () 1 / 132 is the number
• 11. The first term A1 of known sequence {an} is 1, and the point an is 1（ an.an +1) On the image of function y = x / x + 1, we prove that the slope of chord an + 1 increases with the increase of n
• 12. Solving inequality! [x + 3] + [X-2]
• 13. (1 / 2) P is a moving point on the circle x ^ 2 + y ^ 2 + 4x-6y = 0, find (1) fixed point Q (1, - 1) minimum value of PQ, (2) fixed point n (- 2,2), find PQ (1 / 2) P is a moving point on the circle x ^ 2 + y ^ 2 + 4x-6y = 0, find (1) the minimum value of fixed point Q (1, - 1) and (2) the minimum value of fixed point n (- 2,2)
• 14. Decomposition factor: (2x + y) ^ 2-4x-2y + 1
• 15. Simple calculation: 986 × 89-987 × 88
• 16. Given the function y = - x2 + 2x + 3, when x satisfies what condition, the function value y ≤ 0, when x satisfies x ≥ 2, then the range of function y is----
• 17. Finding the general term formula an = 2A (n-1) + 2 ^ n + 1 Please see that the + 1 at the back of the question is outside, not (n + 1), and the (n + 1) in front of it is a corner mark. a1=5
• 18. Let y = sin2x ＋ √ [1 + 2x] + E & # 179;, find dy / DX
• 19. How to simply calculate 9.9 × 99 + nine and nine tenths I'm in a hurry
• 20. Given that a parabolic equation passes through a point (x0, Y0) and the tangent slope of the point is k, how can we find the parabolic equation As mentioned above