1,x=[-b_+(b^2-4ac)^0.5]/2a=[6_+(6^2-4*3*-2)^0.5]/2*3=(6_+60^0.5)/6=(6+2*15^0.5)/6=1+15^0.5/3或1-15^0.5/3注:其中_+为加减,不好打^0.5即为开方2,x=[-b_+(b^2-4ac)^0.5]/2a=[3^0.5_+(3-4*1*-0.25)^0.5]/2=(3^0.5...