2. If the result of simplifying | 1-x |- root number x-8x+ 16 (all in the root number) is 2x-5, find the value range of x. 。
3. At Rt⊿ABC, ∠ C = 90, AC=7/2, BC= radical number 3, find the length of AB.
4. (Decomposition in real number range)
( 1).x^3-2x
(2).x^2-4x+2
5. Knowing that both A and B are real numbers, a= 1/2+ radical number 4b+ 1 (both within the radical number)+radical number 1-4b (both within the radical number), find the value of b/a..
6. To know the root number x=2-a/2, simplify the root number x+2a (all in the root number).