Divide the 3-meter-long rope into 7 sections, each section is () meters long, and each section is a fraction of the total length

3÷7=3/7 （3/7）÷3=1/7

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1. Divide a 5-meter-long rope into seven sections. How many meters long is each section? Pay attention to the name of the unit with meters! Try to play as complete as possible!
2. The problem of discontinuity The number of discontinuities of function f (x) = SiNx / x + e ^ X / 1-x is? When x = 0, there is a discontinuous point? Why is this? Is the point function undefined, or does the limit not exist, or does the limit exist but not equal to the value of the point function? 1-x is the denominator as a whole. Why isn't the function defined at 0?
3. Given that {an} is an arithmetic sequence, a1 + A2 +. + A50 = 200, A51 + a52 +. + A100 = 2700, then what is A1 equal to
4. What is the formula for calculating the standard deviation?
5. By establishing the space rectangular coordinate system and proving that the normal vectors of two planes are perpendicular, we can deduce: are these two planes perpendicular to each other?
6. As shown in the figure, in RT △ ABC, ∠ ACB = 90 ° and AC = B, BC = a, ab = C, the bisector of ∠ A and ∠ B intersects at O, the distance from O to AB is OD, what is the quantitative relationship between od and a, B, C I know the answer is od = (a + B-C) / 2,
7. On the number axis, the distance from point a to the origin o is equal to 2, and on the left side of the origin, the distance from point B to the origin is equal to 7. Find the distance between two points a and B. if the position of point a remains unchanged and the distance between two points a and B is equal to 9, what is the number represented by point B?
8. What is the power factor of 380V and 180A?
9. When an electric furnace works, it converts electric energy into heat energy, When an electric furnace works, it turns electric energy into heat energy; when an electric furnace works, it turns electric energy into heat; when an electric furnace works, it turns electric energy into internal energy! Which statement is correct? What's the difference between the three?
10. How many watts is the power supply of 220 V, 3a, 50 Hz? My power supply is the power supply of the computer, which is standard for Jinhe Tian chassis
11. The 6-meter-long rope is divided into seven sections, each of which accounts for several parts of the total length, and each section is several parts of the length
12. Divide the 3-meter-long rope into 7 sections. How much is the length of each section? How many meters is the length of each section?
13. Divide an 8 / 9 meter rope into four sections. What's the length of each section? What's the length of each section
14. Cut a 3-meter-long rope into 4 sections on average, and each section accounts for 3 meters of () (), each section is () () meters, which is 1 meter of () ()
15. Cut the 5-meter-long rope into 8 sections on average. How long is each section? How many parts of each section?
16. 4 hours 15 minutes = what time 15 minutes = 0.15 * 60 = 9 how to calculate 4 hours
17. An hour and 15 minutes is a fraction of an hour
18. Two hours and 15 minutes is a fraction of an hour
19. Five decimeters is a fraction of a meter. 25 minutes is a fraction of two hours Five decimeters is a fraction of a meter. 25 minutes is a fraction of two hours
20. 15 minutes = fraction of an hour