f(x) |
g(x) |
A.大于0,单调递增 | B.小于0,单调递减 |
C.小于0,单调递增 | D.小于0,单调性无法确定 |
f(x) |
g(x) |
f(x1) |
g(x1) |
f(x2) |
g(x2) |
f(x1)g(x2)-f(x2)g(x1) |
g(x1)g(x2) |
f(x1)g(x2)-f(x1)g(x1)+f(x1)g(x1)-f(x2)g(x1) |
g(x1)g(x2) |
f(x1)[g(x2)-g(x1)]+[f(x1)-f(x2)]g(x1) |
g(x1)g(x2) |
f(x1) |
g(x1) |
f(x2) |
g(x2) |
f(x1) |
g(x1) |
f(x2) |
g(x2) |
f(x) |
g(x) |
A.(-∞,-
| B.(-
| C.(-∞,-
| D.(1,∞) |
f(x) |
2 |
x |
x+2 |
g(x2) |
2 |
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