解方程:(1)(2x-1) 2 =3-6x;(2)用配方法解方程2x 2 +x-6=

解方程:(1)(2x-1) 2 =3-6x;(2)用配方法解方程2x 2 +x-6=0
2024-11-25 13:37:15
推荐回答(1个)
回答1:

(1)(2x-1) 2 =3-6x,
整理得(2x-1) 2 +3(2x-1)=0,
即:(2x-1)(2x+2)=0,
∴2x-1=0,2x+2=0,
解得x 1 =0.5,x 2 =-1;

(2)∵2x 2 +x-6=0,
∴2x 2 +x=6,
∴2(x 2 +
1
2
x+
1
16
)=6+
1
8

∴2(x+
1
4
2 =
49
8

(x+
1
4
2 =
49
16

x+
1
4
7
4

∴x 1 =-2,x 2 =
3
2