3X²-5X-6X+10-1=0
3X²-11X+9=0
a=3b=-11c=9
b²-4ac=（-11）²-4*3*9
=121-108=13
X= [ -b±√（b²-4ac）] /2a
=﹙11±√13﹚/6
x①=﹙11+√13﹚/ 6X②=﹙11-√13﹚/ 6