All the expressions of words and letters before the ion in the ninth grade
1、 The reaction of substance and oxygen: (1) the reaction of elemental and oxygen: 1. Magnesium burning in air: 2mg + O2 igniting 2MgO 2. Iron burning in oxygen: 3Fe + 2O2 igniting Fe3O4 3. Copper heating in air: 2Cu + O2 heating 2CuO 4. Aluminum burning in air: 4Al + 3O2 igniting 2A
RELATED INFORMATIONS
- 1. Chemical oxygen production should be complete and good
- 2. In VB, such an expression M 5
- 3. The value of expression "25 / 2 ^ 3" in VB? Why?
- 4. How to write the expression in VB sq1 = Trim(Text4.Text) IF.THEN How to write an expression like "SS%" here
- 5. Ask the great Xia about the meaning of an expression in VB pi=4# * Atn(1#) edal=edal/100#
- 6. Chemistry (converting literal expressions into chemical equations) 1.h2+02-h20 2.h2+o2-hcl 3.c+o2- 4.s+o2- 5.hg+o- 6.p+o2- 7.fe+o2- 8.mg+o2-mgo
- 7. It is proved that the line passing through the right focus F of the ellipse intersects with the ellipse at a and B, and when the line is perpendicular to the X axis | ab | is the shortest It is proved that the line passing through the right focus F of the ellipse x ^ 2 + 4Y ^ 2 = 4 intersects the ellipse at a and B, and | ab | is the shortest when the line is perpendicular to the X axis Please prove that, in fact, when it is not vertical, | ab | > 1
- 8. Principles of Computer Organization Second Edition (Tang shuofei) Chapter 6 after class exercise answers 6.27 second sub question steps and answers,
- 9. Multiple choice question x = 0 is a function y = arctan1 / X X = 0 is the function y = arctan1 / X A. Removable discontinuities B. Jump breakpoint C. Infinite discontinuity D. Oscillation discontinuity
- 10. 1. Four fifths of the total length of a road has been built, and what percentage of the road has not been built? 2. The Yellow river steamer sails from port a to port B. the journey between the two ports is 120 kilometers. The distance that has been sailed is one fifth of the remaining distance. How many kilometers is this freighter away from port B 3. The kilogram of an orange is 2 / 3 of that of an apple, and that of a banana is 1 / 2 of that of an orange
- 11. Please write the following changes in the text expression 1. A dark red powder burns in oxygen and produces a lot of white smoke 2. A light yellow powder burns in the air and gives off a weak light blue flame 3. A silvery white metal burns in oxygen 4. A kind of black powder burns violently in oxygen and emits white light. The colorless gas generated can make clear lime water turbid
- 12. 1 / 3, 1 / 7, 1 / 9... The nth number is
- 13. The nth number is 2 4 6 8 10 what is the nth number? What is the nth number 14 9 16 25 what is the nth number? 12 / 14 / 18 / 16 what is the nth number What is the nth number of 0 3 8 15 24? What is the nth number of 1 3 6 10 15 What is the number n of 24 8 16 32
- 14. 1. - 3.5. - 7.9 according to this rule, how to express the nth number
- 15. 1, 3, 5, 7, 9. What's the nth number
- 16. 1, - 3,5, - 7... According to this rule, what is the nth number?
- 17. 1,5,9,13,17. Express the nth number with algebraic formula
- 18. A string number: 5, 10, 17, 26 The nth number is represented by an algebraic expression containing n
- 19. As in 2 / 3 - 3 / 4 4 / 5 - 5 / 6 6 / 7 - 7 / 8, the nth number
- 20. -1 / 2,2 / 3, - 3 / 4,4 / 5, - 5 / 6,7 / 8... Conjecture the sum of the nth number and the nth plus one number (n is odd)