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What is the fourth digit to the left of the decimal point in the decimal? What is its counting unit?
In decimals, the fourth digit to the left of the decimal point is (thousand), and its counting unit is (thousand)
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- 1. In a series circuit, there are two resistors R1, R2, where R1 = 4 ohm In a series circuit, there are two resistors R1 and R2, in which R1 = 4 Ω. When the resistor is installed in the circuit with voltage of 6V after series connection, the actual power consumed by R2 is 2W. Calculate the resistance value of R2! Clear thinking, the right person is much better than the right person within 1 hour
- 2. It is known that y = f (x) is a function with a period of 2 π. When x ∈ [0, 2 π], f (x) = sinx2, then the solution set of F (x) = 12 is () A. {x|x=2kπ+π3，k∈Z}B. {x|x=2kπ+5π3，k∈Z}C. {x|x=2kπ±π3，k∈Z}D. {x|x=2kπ+（-1）kπ3，k∈Z}
- 3. Let the function FX = ax + cosx, x [O, π], let the function FX be less than or equal to 1 + SiNx, and find the value range of A
- 4. If f (x) = (1 - λ) SiNx - (1 / 2 + 1 / 2 λ) cosx + 1 is an increasing function in [- π / 2, π / 2], find the range of λ!
- 5. Let f (x) = ax + cosx, X ∈ [0, π]. (I) discuss the monotonicity of F (x); (II) Let f (x) ≤ 1 + SiNx, find the value range of A
- 6. Given the function f (x) = x-ax ^ 3 (a > 0), G (x) = SiNx, when x belongs to 0 to half of π, G (x) greater than or equal to f (x) is constant, the range of a is obtained
- 7. Given the function f (x) = / SiNx /, (1) if G (x) = ax-f (x) > = 0 is constant for any x ∈ [0, + infinity), find the value range of real number a 2) If the image of the function f (x) = | SiNx | and the line y = KX (k > 0) have and only have three common points, and the maximum abscissa of the common point is α, it is proved that cos α / (sin α + SIN3 α) = (1 + α 2) / 4 α
- 8. Let f (x) = SiNx (x ≥ 0), G (x) = ax (x ≥ 0), where a is a real number 1. If f (x) ≤ g (x) is constant, find the value range of real number a 2. When a = 1, we prove that G (x) - f (x) ≤ (1 / 6) x & # 179; (x ≥ 0)
- 9. If there are two tangents perpendicular to each other on the function f (x) = ax + SiNx, the range of real number a is obtained But the answer is a = 0. how?
- 10. It is known that f (x) is a piecewise function: when x ≥ 0, f (x) = 1, X
- 11. A resistor with a resistance value of 6 ohm, in a period of time, the amount of electricity passing through it is 2 banks, and the heat generated by the resistor is 12 joules______ V, it's been a long time______ Seconds
- 12. Solution: to make the image of function y = (2m-3) x + (3m + 1) pass through the positive half axis of X and Y axis, what is the value range of M?
- 13. The power loss of the conductor is 20% of the transmission power when the voltage of 220 V is used in a substation. If the power loss of the conductor is to be reduced to 5% of the transmission power, what is the transmission voltage?
- 14. On several mathematical problems of fractions (1) The distance between station a and station B is 1280km. After adopting the "harmony" EMU to increase the speed, the running speed of the train is 3.2 times of the original, and the time from station a to station B is shortened by 11 hours, so the speed of the train after increasing the speed can be calculated (2) The distance between a and B is 36km. A and B start from a and B at the same time and walk towards each other. When they meet, a is 16km away from B. after meeting, they continue to move forward. A arrives at B 1.8h earlier than B arrives at a. find out the walking speed of a and B
- 15. As the resistance increases, the power consumption will decrease 1. Getting bigger 2, smaller 3. Unchanged 4. Unable to judge
- 16. 3m(m+1)^2=?
- 17. For two-phase 380V electric welding machine, it is said that the voltage difference between two phases is 380V when connecting two phases, but the control circuit is 220V. How can it also connect two phases?
- 18. The fourth power of 9x - the square of 6x + 1-A power B power factorization
- 19. In the observation chart of the problem solution of "innovation class refining" in grade one of junior high school, the numbers corresponding to the four points of ABCD on the number axis are all integers, and their corresponding numbers are ABCD, and C-2A = 7 —.—.—.—.—.—.—.—.—.—.—> A B C D Then the origin should be a or B or C or
- 20. Calculation: (- 2000 5 / 6) + (- 1999 2 / 3) - (4000 3 / 4) - (+ 1 1 / 2)