①a=0,x+1>0,x>-1
②a0 x(-1+√Δ)/2a
③a=1/4 Δ=1-4a=0 x≠-2
④a>1/4 Δ=1-4a
接不等式 ax²+x+1>0 (a屬于R)
接不等式 ax²+x+1>0 (a屬于R)
數(shù)學(xué)人氣:566 ℃時間:2020-04-07 12:05:13
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