The solution of the equations 3x + 8y = 128x + 3Y = - 1 is

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• 1. If P is a point on the ellipse x ^ 2 / 4 + y ^ 2 = 1, F1 and F2 are the two focal points of the ellipse, and ∠ f1pf2 = 60 degrees, then the area of △ f1pf2 is__
• 2. Simple calculation method of 9.7 * 1.25 * 0.8
• 3. For the problem of calculating the proportional value, please post the formula process, It costs 23000 yuan for the three of them to buy a thing together, 6440 yuan for a, 6900 yuan for B and 9660 yuan for C. what's the correct ratio of the three of them? Please post the answer formula,
• 4. Simple calculation: how to calculate 125 × 25 × 32 × 17 with simple algorithm is urgent, Don't have any symbols in it,
• 5. If x ^ 2 + y ^ 2 + 2x + 2Y + 1 = 0, then the value range of X + y is?
• 6. What is the solution set of inequality X-2 divided by 3 ≤ 1
• 7. If the distribution function of random variable x is f (x) = a + barctanx, then a =?
• 8. Monotone interval common of function f (x) = (x + 3) multiplied by absolute value X-1
• 9. The original price of a color TV set is 4200 yuan. The first price increase is 1 / 10, and the second price decrease is 1 / 5. What's the current price?
• 10. The original price of a certain brand of color TV is 1500 yuan. After the price is raised by one tenth, the price is reduced by one tenth. How much is the current price
• 11. It is known that the length of the diagonal of a cuboid is root 29, and the sum of length, width and height is 9. The surface area of the cuboid can be obtained Specific process and answer, please do it
• 12. 3, - 3,8, - 8 are 24 points-
• 13. The scores of ten students in the first group of Mathematical Olympiad are as follows: 95, 93, 97, 88, 89, 97, 92, 90, 89, 94 Total score
• 14. If (5x-60) &# 178; and the radical Y-3 are opposite to each other, then the value of the radical X-Y is ()
• 15. In the function given below, it is not only an even function with period π, but also an increasing function on the interval (0, π / 2) A.y=x^2(x∈R） B.y=|sinx|(x∈R） C.y=cos2x(x∈R） D.y=e^(sin2x)(x∈R）
• 16. ∫（lnx/x^3）dx
• 17. Let x1, X2 Xn is the sample of population x, the population variance exists, Xbar is the sample mean, find the correlation coefficient between X1 and Xbar
• 18. It is proved by definition that if xn > 0 (n = 1,2,...), and lim (n →∝) xn = a > = 0, then LIM (n →∝) √ xn = √ a
• 19. How to find the maximum, minimum, range and definition of sine, cosine and tangent functions
• 20. No matter how the sliding rheostat slides, the voltage of the appliance or resistor will remain unchanged. If it changes, what will happen? Is there one more resistor in series? 2. The voltmeter is connected between the positive and negative poles of the power supply, but there is an electrical appliance in the middle. What will be the consequence? 3. The voltmeter is connected between two points of ab. there is a bulb before AB, but the voltmeter has no indication, which means that the bulb has short circuit indication, but the lamp has open circuit. What does it mean? The change in question 1 refers to the change in the resistance of electrical appliances or series connection. If it does not change, why use sliding rheostat to change the voltage in the test to explore the relationship between current, voltage and resistance? The third question should be what happened when the voltmeter didn't show the number