2X+1-x-2分之1-(2X+1-X²-4分之4)等于多少?

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/10 07:06:01

2X+1-x-2分之1-(2X+1-X²-4分之4)等于多少?
2X+1-x-2分之1-(2X+1-X²-4分之4)等于多少?

2X+1-x-2分之1-(2X+1-X²-4分之4)等于多少?
2X+1-x-2分之1-(2X+1-X²-4分之4)
=2x+1-1/(x-2)-(2x+1-4/(x²-4)
=2x+1-1/(x-2)-2x-1+4/(x²-4)
=4/(x²-4)-1/(x-2)
=(4-x-2)/[(x-2)(x+2)]
=-(x-2)/[(x-2)(x+2)]
=-1/(x+2)

解: 2X+1-x-2分之1-(2X+1-X²-4分之4)
=2x+1-x-1/2-(2x+1-x²-1)
=2x+1-x-1/2-2x+x²
=x²-x+1/2
祝你开心