3X平方—8X—3=0
∵a=3,b=-8,c=-3；
b²-4ac=(-8)²-4×3×﹙-3﹚=100﹥0
∴X1=﹙8+√100﹚／﹙2×3﹚=3;
X2=﹙8-√100﹚／﹙2×3﹚=-1／3
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