3x²-9x+2=0 x²-3x=-2/3 x²-3x+(3/2)²=-2/3+(3/2)²(x-3/2)²=19/12 x-3/2=±(√57)/6 x=(9+√57)/6或x=(9-√57)/6
解:x(3x-9)=0 x1=0 x2=3 求采纳
回答:3x²-9x+2=3(x^2-3x+9/4)-27/4+2=3(x-3/2)^2-19/4=0 (x-3/2)^2=19/12
3x^2-9x+2=0 3(x-3/2)^2=27/4-2 (x-3/2)^2=19/12 x-3/2=±√57/6 x=3/2+√57/6或x=3/2-√57/6
3x^2-9x+2=0 x=[9±根号(81-24)]/6 =[9±根号57]/6 所以 x1=(9+根号57)/6 x2=(9-根号57)/6
3x平方=9x 解:移项得:3x平方-9x=0 提取公因式3x得:3x(x-3)=0 x1=0 或 x2=3
3x^2-9x=0,所以3x^2=9x,所以x^2=3x,所以x=3 x^2-6x+8=0,所以x^2-2*3*x+9-1=0,所以(x-3)^2-1=0,所以(x-3)^2=1,所以x-3=正负1,所以x=4或者2
分析:用公式法来解。解:3X²-9X+2=0 ∵a=3, b=-9, c=2 b²-4ac=(-9)²-4×3×2 =81-24 =57 ∴x=[-(-9)±√57]/(2×3)=(9±√57)/6 x1=(9+√57)/6, x2=(9-√57)/6.
(3X-1)(3X-2)=0 X=1/3 或 x=2/3 希望能帮你忙,不懂请追问,懂了请采纳,谢谢
解:3x²-9x+2=0 x²-3x+2/3=0 x²-3x+9/4=19/12 (x-3/2)²=19/12 x-3/2=(±√57)/6 x=(±√57)/6+3/2