How to express half and one third

A piece of pizza, cut into six pieces, three pieces is half, two pieces is one third, together is five sixths

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1. Quarter to x = half to one sixth how?
2. Which God simply explained the "sound value combination method", thank you
3. What's the meaning of set description? How to explain his concept? Why to express it like this? {xix-3 > 2} what does each letter mean? I really don't know how to express in this way whether certain objects belong to certain conditions, what are certain conditions, and where are certain objects?
4. What do you mean by this idiom
5. What is the process of dehydrohalogenation
6. For dimming bulbs, Xiao Ming thinks that when the lamp is dark, it saves more power than when it is on, but Xiao Lin thinks that when the lamp is dark, the power of sliding rheostat increases, so it doesn't save power. Q: who is right? Briefly describe your reasons (Baidu has many different answers, Dashen must do it by himself!)
7. One in half, one in three, three in two, two in nine... Rule
8. What are their rules? What are the last two?
9. There is a series of numbers: one-half, one-half, two-thirds, one-third, two-thirds, three-thirds. According to this law, what is the number of the third column
10. Minus one times one half equals minus one plus one half. Why? It's due tomorrow!
11. How many addition and subtraction formulas can be composed of any two numbers in 160720250? Write them down and calculate them
12. Use the five numbers half, one third, one fourth, one fifth and one sixth to form the formula of addition and subtraction and write the number
13. In 1 / 3 × 12, 12 × 1 / 3, 1 / 3 × 5 / 7, 4 / 3 × 0, 5 / 2 × 1, 1 / 3 × 1 / 2 In 1 / 3 × 12,12 × 1 / 3, 1 / 3 × 5 / 7, 4 / 3 × 0, 5 / 2 × 1, 1 / 3 × 1 / 2, the product of the maximum and the first factor () is equal to that of the first factor () and less than that of the first factor () is equal to that of the product ()
14. X - (2 / 7 + 3 / 7) = 4 / 7 + X + 1 / 2 = 15 / 8, 4 / 5 - x + 1 / 3 = 5 / 6
15. (3 / 4 minus 1 / 2) × (1 / 3 + 1 / 4) =? [to calculate the process]
16. 1994 plus one half minus one and one third plus two and two thirds minus three and one third plus four and one half minus five and three thirds
17. Simple calculation by multiplying 2009 ^ / 2010 by 2008 + 1
18. Multiply (one minus one hundredth) by (one minus one ninety-nine) How much is (one minus one fourth) multiplied by (one minus one third)
19. How much does "one hundredth" add to "ninety-nine hundredth"?
20. One hundredth minus one hundredth minus one hundredth minus one hundredth minus one hundredth minus one hundredth minus one hundredth minus one hundredth minus one hundredth minus one hundredth minus one hundredth minus one hundredth minus one hundredth minus one Hun? （1/100-1）*（1/99-1）*（1/98-1）.（1/2-1）=? The problem is to multiply up to half