x²+3x-1=0,1/(x-2)×(x²-4x+4)/(x+1)-(x-1)/(x+2)

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/12 09:07:40

x²+3x-1=0,1/(x-2)×(x²-4x+4)/(x+1)-(x-1)/(x+2)
x²+3x-1=0,1/(x-2)×(x²-4x+4)/(x+1)-(x-1)/(x+2)

x²+3x-1=0,1/(x-2)×(x²-4x+4)/(x+1)-(x-1)/(x+2)
x²+3x-1=0 x²+3x=1
1/(x-2)×(x²-4x+4)/(x+1)-(x-1)/(x+2)
=(x²-4x+4)/(x-2)(x+1)-(x-1)/(x+2)
=(x-2)²/(x-2)(x+1)-(x-1)/(x+2)
=(x-2)/(x+1)-(x-1)/(x+2)
=(x-2)(x+2)/(x+1)(x+2)-(x-1)(x+1)/(x+1)(x+2)
=(x²-4-x²+1)/( x²+3x+2)
=(-3)/3
=-1