How much is one minus four?

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• 1. What's the difference between two thirds of nine and two thirds of nine
• 2. 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
• 3. 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
• 4. An 8-meter-long rope, the first cut half of the court, the second cut two fifths of the meter, how many meters left
• 5. 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
• 6. Simple calculation of one third times five sixteenth times three fifths
• 7. What's the difference between subtracting the quotient of 1 / 5 / 6 / 7 from the reciprocal of 1 / 2 / 7? I have the wrong number. Division, not division
• 8. -6 / 11 5.4 | - 1 / 3 | 2 - 3.8 - 1.1 find the reciprocal and arrange the reciprocal from small to large
• 9. When a number is divided by 2 / 9, its quotient is the reciprocal of the fractional unit of 2 / 9. What is the number?
• 10. What's the difference between the 3 / 2 quotient of 7 and the reciprocal of 1 / 3 (3 / 8 + 3 / 4) / (8 / 2-7) 3.6-8 / 17-17 / 3 * 3 2.7-4.8 * (4 / 5-4.8)
• 11. What's 5 and 2 / 5 minus 8
• 12. How much is 3 minus 5?
• 13. How much is 36 × 1 / 3 minus 1 / 4
• 14. (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?
• 15. 2. 13 and 21 / 13 times 7, please calculate
• 16. 11 out of 8 minus 11 out of 15
• 17. 3.14 times 1 and 3 / 8 plus 0.314 times 25 / 4 minus 31.4 times 0.2
• 18. One in three, one in two minus one in two, one in four equals zero with brackets
• 19. 3 of 7 parts plus 3.6 minus 1 of 7 parts plus 6.4 (simple calculation)
• 20. 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