(1)x2+x-6≥0 (2)-x2+2x+3>0 (3)x2+4x+4>0
1个回答
x²+x-6≥0,(x-2)(x+3)≥0,x≤-3 or x≥2
-x²+2x+3>0,x²-2x-3
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(1)x²+x-6=0 (2)x²-√3 x-1/4=0 (3) 3x²-6x-2=0 用