2. 13 and 21 / 13 times 7, please calculate
ninety-five and one-third
A mathematical problem: 5 / 14 × 21 × 20
5/14 × 21 × 1/20
= 5/2 × 3 × 1/20
= 3/2 × 1/4
= 3/8
RELATED INFORMATIONS
- 1. (21:22:11 on the 22nd) Ship a flows downstream from wharf a, and ship B flows upstream from wharf B. the two ships are traveling at the same time and meet at the midpoint. The speed of ship B downstream is twice that of ship a upstream. The known water speed is 4km / h. how to calculate the speed of the two ships in still water?
- 2. How much is 36 × 1 / 3 minus 1 / 4
- 3. How much is 3 minus 5?
- 4. What's 5 and 2 / 5 minus 8
- 5. How much is one minus four?
- 6. What's the difference between two thirds of nine and two thirds of nine
- 7. ① A number, minus the product of 3.5 and 4, the difference is 1 / 2 of 20, how much is this number ② What is the difference between the reciprocal of 2 and the sum of 2.5 divided by the quotient of 1 / 2, minus the quotient of 0.5 divided by 1 / 4? ③ Simple operation 1 / 5 △ 12 + 4 / 5 × 1 / 13 ③ Simple operation 1 / 5 △ 13 + 4 / 5 × 1 / 13
- 8. For a rope, cut half a meter for the first time, two fifths of a meter for the second time, and how many meters for the second time
- 9. An 8-meter-long rope, the first cut half of the court, the second cut two fifths of the meter, how many meters left
- 10. A rope is two fifths of a meter long. Cut off half of it in the first time, the remaining one-third in the second time, and the remaining one-quarter in the third time. How many meters is left in this rope
- 11. 11 out of 8 minus 11 out of 15
- 12. 3.14 times 1 and 3 / 8 plus 0.314 times 25 / 4 minus 31.4 times 0.2
- 13. One in three, one in two minus one in two, one in four equals zero with brackets
- 14. 3 of 7 parts plus 3.6 minus 1 of 7 parts plus 6.4 (simple calculation)
- 15. Write the simple calculation process (1) 1 and 7 / 3 * 5 / 2 + 2 and 7 / 4 * 5 / 2 + 2 / 5 (2) 2.5 * 12.5 * 3.2 (3) (8 / 2) (3) (7 / 8-7 / 12) * 2.4/1 / 7 (4) 805 * 101-805
- 16. 21:56 = 3 / 8 = 12 △ () = ()
- 17. A resistor is connected in series with a 3-ohm resistor and then connected in the original circuit. If the current passing through becomes 4 / 5 of the original current, what is the resistance value of this resistor?
- 18. 100 points
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