-½X²-3X+6=0
a=-½b=-3c=6
b²-4ac=(-½)²-4×(-3)×6=四分之二百八十九>0
X₁=(3-二分之十七)÷(-1)=二分之十一
X₂=(3+二分之十七)÷(-1)=负二分之二十三
打字不易,如满意,望采纳.
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