解不等式:(1).2x^2+7x+3>0; (2).-x^2+8x-3>0; (3).ax^2-(a+1)x+1

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解不等式:(1).2x^2+7x+3>0; (2).-x^2+8x-3>0; (3).ax^2-(a+1)x+1

解不等式:(1).2x^2+7x+3>0; (2).-x^2+8x-3>0; (3).ax^2-(a+1)x+1
解不等式:(1).2x^2+7x+3>0; (2).-x^2+8x-3>0; (3).ax^2-(a+1)x+1

解不等式:(1).2x^2+7x+3>0; (2).-x^2+8x-3>0; (3).ax^2-(a+1)x+1
(1).2x^2+7x+3>0;
(2x+1)(x+3)>0
x>-1/2 或x0
x^2-8x+3