N is the number in 4,6,8,12,16,18_______ When √ N and √ 2 are quadratic radicals of the same kind What's in the blank? I don't understand the blank. I understand what you say

If the square root number in the space is 4,6,8,12,16,18, which are the same radical of root 2? So fill in 8,12,18

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1. 2a-b-(-3a)+2b-(-3c)-|a|-|b|+|c| Just simplify
2. A + 2B = 22b + 3C = 3C + 3A = 7, find the solution of a + B + C
3. On distinguishing quadratic radical In the following formulas, what is not quadratic radical is: ("√" means "under the root sign") ("& sup2;" means square) A√35 B√3-π C√b²+4 D√2/7
4. Judge whether the following forms are the simplest quadratic radicals: √0.2a,√3ab,√18a²b（a≥0）,1/ab√ab
5. Help me judge if this is the simplest quadratic radical Tick (A & # 178; + B & # 178;) (the square of a under the root plus the square of B) urgent!
6. Basic properties of fraction: the numerator and denominator of fraction are multiplied by (or divided by) the same integral which is not equal to zero, and the value of fraction remains unchanged, which is expressed as
7. In the formula, what conditions should the numerator and denominator satisfy to make their values zero
8. The condition of positive value of fraction: (denominator ≠ 0) the condition of negative value:
9. Is it a fraction to reduce the letters in the denominator Is 3A / a a fraction
10. Is it a fraction only if the denominator is a letter
11. If 1 / 2 √ (2-A) / 6 and 3 √ (2a-3) / 4 are quadratic radicals of the same kind, then the value of a is ()
12. If the A-B power of & # 178; √ 4A + B and √ 23 is the same kind of quadratic radical, find the value of √ a + B / 1
13. The second radical xYx (Y > 0) is reduced to the simplest second radical xYx (Y > 0)___ ．
14. Reduced to the simplest quadratic radical √ 20x & # 178; Y (x > 0)
15. The following quadratic radical is reduced to the simplest one: radical [2 / 5 (x + y)] (x > 0, Y > 0)
16. Is it the simplest quadratic radical
17. Which is the simplest quadratic radical
18. Is 1 / radical 2 the simplest quadratic radical
19. A mathematical problem of finding the law in the first day of junior high school Serial number 1 2 3 4 5 6... N Number 1 3 7 15 127? Add context
20. The general term formula of 3 / 2,1,7 / 10,9 / 17