eg.x²-3x+2<0快啊
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eg.x²-3x+2<0快啊
eg.x²-3x+2<0快啊
eg.x²-3x+2<0快啊
x²-3x+2<0
∴(x-1)(x-2)
(x-1)(x-2)<0
1. x-1<0 x-2>0
x1<1 x2>2
这个没有解集
2. x-1>0 x-2<0
x1>1 x2<2
1
x²-3x+2<0
(x-1)(x-2)<0
1
x²-3x+2<0
(x-1)(x-2)<0
1