1、(1-√2)(1+√2)+√75+(5√3-4√2)^0

问题描述:

1、(1-√2)(1+√2)+√75+(5√3-4√2)^0
2、用配方法:x^2=2x+2
3、(x-2)(4x+3)+(2-x)(x-5)=0
4、在实数范围内分解因式:2x^2-2x-1

1、(1-√2)(1+√2)+√75+(5√3-4√2)^0
=1-2+5√3+1
=5√3
2、用配方法:
x^2=2x+2
x^2-2x+1=3
(x-1)^2=3
x-1=±√3
x=1±√3
3、(x-2)(4x+3)+(2-x)(x-5)=0
(x-2)(4x+3-x+5)=0
(x-2)(3x+8)=0
x=2x=-8/3
4、在实数范围内分解因式:
2x^2-2x-1
=2(x^2-x+1/4-5/4)
=2[(x-1/2)^2-5/4]
=2(x-1/2+1/2√5)(x-1/2-1/2√5)
=(2x-1+√5)(x-1/2-1/2√5)