1.(3x-√3)²=27 2.(x+1/2)²-5=0 3.x²-4x-6=0 4.x²+2x+3=0

问题描述:

1.(3x-√3)²=27 2.(x+1/2)²-5=0 3.x²-4x-6=0 4.x²+2x+3=0

1.3x-√3=±3√3 ,3x=√3±3√3,x=(√3±3√3)/3.
2.x+1/2=±√5 x= -1/2±√5.
3.x=﹙4±√4²-4x1x(-6)﹚/2=(4±√40)/2=2±√10.
4.2²-4x1x3<0无解