1、因为4(x²-1/4x+1/64)-1/16-9=0,即:4(x-1/8)²=145/16,亦即:(x-1/8)²=145/64
所以:x-1/8=±√ 145/8,即:x=(1±√ 145)/8
2、因为3(x²+2x+1)-8=0,即:(x+1)²=8/3,所以:x+1=±2√ 6/3
即:x=(-3±2√ 6)/3
1.4x²=9
4x²-x+(1/2)²=9+(1/2)²
(2x-1/2)²=9/4
2x-1/2=+-3/2
2x-1/2=3/2或2x-1/2=-3/2
x1=1,x2=-1/2
2.3x²+6x=5
3x²+6x+9=14
(根号3x+3)²=14
3x+3=+-根号14
3x+3=根号14或3x+3=-根号14
x1=根号14-3/3,x2=-根号14-3/3
(1) 4x²-x-9=0
(2x-1/4)²-1/16-9=0
(2x-1/4)²=145/16
2x-1/4=±√145/4
x=(1±√145)/8
(2) 3x²+6x-5=0
3(x+1)²=8
x=(±2√3/3)-1