Question

2X的平方－3X－6＝0用配方法怎么算？

Answer 1

解：2x²－3x=6
两边同除以2：x²－(3/2)x=3
x²－(3/2)x + (3/4)²=3 + (3/4)²
(x － 3/4)²=57/16
开方：x － 3/4=±(√57)/4
x=3/4 ± (√57)/4
∴x=(3 ± √57)/4

Answer 2

2X的平方－3X－6＝0用配方法怎么算 2x²-3x-6=0，x²-3x/2-3=0，x²-2×3x/4+9/16-9/16-3=0，(x-3/4)²-9/16-3=0，(x-3/4)²=57/16，解得x-3/4=±√57/4，即x=(3±√57)/4 2x²-3x-6=0x² - 3/2 x - 3 =0x² - 3/2 x + 9/16 = 3 + 9/16(x -3/4)² = 57/16x -3/4 = ±√57 /4x = (3±√57) / 4 2X²-3X-6=0X²-1.5X=3（X-0.75）²=3+0.75²（X-0.75）²=57/16X-0.75=±根号57/4X1=0.75+根号57/4X2=0.75-根号57/4

Answer 3

2X的平方－3X－6＝0用配方法怎么算 2x²-3x-6=0，x²-3x/2-3=0，x²-2×3x/4+9/16-9/16-3=0，(x-3/4)²-9/16-3=0，(x-3/4)²=57/16，解得x-3/4=±√57/4，即x=(3±√57)/4 2x²-3x-6=0x² - 3/2 x - 3 =0x² - 3/2 x + 9/16 = 3 + 9/16(x -3/4)² = 57/16x -3/4 = ±√57 /4x = (3±√57) / 4 2X²-3X-6=0X²-1.5X=3（X-0.75）²=3+0.75²（X-0.75）²=57/16X-0.75=±根号57/4X1=0.75+根号57/4X2=0.75-根号57/4

Answer 4

2X的平方－3X－6＝0用配方法怎么算 2x²-3x-6=0，x²-3x/2-3=0，x²-2×3x/4+9/16-9/16-3=0，(x-3/4)²-9/16-3=0，(x-3/4)²=57/16，解得x-3/4=±√57/4，即x=(3±√57)/4 2x²-3x-6=0x² - 3/2 x - 3 =0x² - 3/2 x + 9/16 = 3 + 9/16(x -3/4)² = 57/16x -3/4 = ±√57 /4x = (3±√57) / 4 2X²-3X-6=0X²-1.5X=3（X-0.75）²=3+0.75²（X-0.75）²=57/16X-0.75=±根号57/4X1=0.75+根号57/4X2=0.75-根号57/4

Answer 5

2X的平方－3X－6＝0用配方法怎么算 2x²-3x-6=0，x²-3x/2-3=0，x²-2×3x/4+9/16-9/16-3=0，(x-3/4)²-9/16-3=0，(x-3/4)²=57/16，解得x-3/4=±√57/4，即x=(3±√57)/4 2x²-3x-6=0x² - 3/2 x - 3 =0x² - 3/2 x + 9/16 = 3 + 9/16(x -3/4)² = 57/16x -3/4 = ±√57 /4x = (3±√57) / 4 2X²-3X-6=0X²-1.5X=3（X-0.75）²=3+0.75²（X-0.75）²=57/16X-0.75=±根号57/4X1=0.75+根号57/4X2=0.75-根号57/4