x²-√3·x-1=0
△=(-√3)²-4·1·(-1)=3+4=7 △=b²-4ac
x1=(√3+√7)/2
x2=(√3-√7)/2要用因式分解不符合十字相乘,不能用因式分解。形为x²+(a+b)·x+a·b=0才能用因式分解。
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