2x |
4x+1 |
x | 1 |
x | 2 |
2x1 |
4x2+1 |
2x2 |
4x2+1 |
2x1(4x2+1)-2x2(4x1+1) |
(4x2+1)(4x2+1) |
(2x1+x2-1)(2x2-2x1) |
(4x2+1)(4x2+1) |
2 |
5 |
1 |
2 |
2-x |
4-x+1 |
2x |
4x+1 |
4 |
5 |
-k |
x |
A.(-∞,0) | B.(0,+∞) | C.(1,+∞) | D.(-∞,1) |
A.增加7.84% | B.减少7.84% | C.减少9.5% | D.不增不减 |
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