x2-(a+3)x+3a>0 还有 ax2-2(a+1)x+4<0

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x2-(a+3)x+3a>0 还有 ax2-2(a+1)x+4<0

x2-(a+3)x+3a>0 还有 ax2-2(a+1)x+4<0
x2-(a+3)x+3a>0 还有 ax2-2(a+1)x+4<0

x2-(a+3)x+3a>0 还有 ax2-2(a+1)x+4<0
1、x2-(a+3)x+3a>0因式分解得:
(x-a)(x-3)>0
a>3,x>a,x