Why is 19 minus 1 equal to 20?

RELATED INFORMATIONS

• 1. How much is 19 minus 15
• 2. How much is twenty minus fifteen
• 3. What is 19:00 minus 18:20?
• 4. What is minus 19 plus 17?
• 5. If the quadratic trinomial X & sup2; + PX + P-1 about X is a complete square, then p= RT
• 6. For the square of quadratic trinomial x minus 10x plus 36, Xiao Cong made the following conclusion: no matter what real number x takes, its value can not be equal to 12. Do you agree with him? Explain your reasons
• 7. On the quadratic trinomial of X, x square + PX + P can be decomposed into (x-1) (x + 6), and the value of P + 3q-2 can be obtained
• 8. Solve the equation. X + 3.2 = 4.64x-3 × 9 = 29 (x-3) △ 2 = 7.5
• 9. Seven out of two times two out of seven minus 4x is one out of two
• 10. 7.5 times x equals (46 minus x) times 5.9
• 11. If (y plus 3) plus (x minus 4) I equals 0, then how much is x equal and how much is y equal
• 12. Why is one minus one equal to three
• 13. 2 minus (1 minus x) equals minus 2
• 14. How much minus seven is minus two
• 15. Negative 21 and 3 / 2 plus (positive 3 and 4 / 1) minus (3 / 2) minus (positive 4 / 1) equals?
• 16. (1 / 2 minus 1 / 3 plus 1 / 4 minus 1 / 5)
• 17. Minus 1 / 2 minus 1 / 5 minus 1 / 8 plus 1 / 11 minus 1 / 20 minus 1 / 41 plus 1 / 110 plus 1 / 1840 equals
• 18. What is minus four plus minus nine
• 19. What is minus three plus nine
• 20. What is four minus six?