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- A math problem (Guangzhou bimodule 8)
A math problem (Guangzhou bimodule 8)
It can be seen that this parabola has an upward opening, one is positive and the other is negative.
f( 1)= a+b- 1 & lt； 0
Which is a+b
If, b>0, yes, 0
If, b
Overview, a-b > - 1
Choose one ~ _ ~
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