大师作文网先化简,再求值:x^2+2x+1/x+2 ÷x^2-1/x-1 - 1-x-x^2/x+2,其中x=2014
来源：学生作业帮 编辑：大师作文网作业帮 分类：数学作业 时间：2024/09/22 03:52:30
先化简,再求值:x^2+2x+1/x+2 ÷x^2-1/x-1 - 1-x-x^2/x+2,其中x=2014
解
(x²+2x+1)/(x+2)÷(x²-1)/(x-1)-(1-x-x²)/(x+2)
=(x+1)²/(x+2)÷(x-1)(x+1)/(x-1)-(1-x-x²)/(x+2)
=(x+1)²/(x+2)×1/(x+1)-(1-x-x²)/(x+2)
=(x+1)/(x+2)-(1-x-x²)/(x+2)
=(x+1-1+x+x²)/(x+2)
=(x²+2x)/(x+2)
=x
=2014
再问： 1/2��12-(2010-��)^0-l1-3tan30��l+(1/2)^-2
再答： �� ԭʽ =��3/12-1-|1-��3|+2² =��3/12-1+1-��3+4 =-11��3/12+4
再问： ���
(x²+2x+1)/(x+2)÷(x²-1)/(x-1)-(1-x-x²)/(x+2)
=(x+1)²/(x+2)÷(x-1)(x+1)/(x-1)-(1-x-x²)/(x+2)
=(x+1)²/(x+2)×1/(x+1)-(1-x-x²)/(x+2)
=(x+1)/(x+2)-(1-x-x²)/(x+2)
=(x+1-1+x+x²)/(x+2)
=(x²+2x)/(x+2)
=x
=2014
再问： 1/2��12-(2010-��)^0-l1-3tan30��l+(1/2)^-2
再答： �� ԭʽ =��3/12-1-|1-��3|+2² =��3/12-1+1-��3+4 =-11��3/12+4
再问： ���
先化简,再求值:2(x+1)(x-1)-x(2x-1),其中x =-2
先化简,再求值:(X-1/X平方-1)-(X/X+1),其中X=2
先化简,再求值(1)(x-1)(x+4)-(x-3)(x+2),其中x=三分之一
先化简,再求值:x(x-1)+2x(x+1)-(3x-1)(2x-5),其中x=2
先化简,再求值:(3x/x-1-x/x+1)×x^2-1/x,其中,x=(根号2)-2
先化简,再求值.(x/x-1-x+1/x-2)除以x平方+2x+1/2x平方-x) 其中满足x平方-x-1=0
先化简,再求值:x^3+2x^2+x/x^2+2x-8除以（x/x-2 × x+1/x+4),其中x=负5/4
先化简代数式再求值(3/x+1 - x+1)÷x²-2x/x+1,其中x满足方程x/x-1+1/x=1
先化简,再求值:(1+x^2)/(1-x^2)÷(2x/1-x -x),其中x=根号2
先化简,再求值 2x-6/4-4x+x^2÷x-3/x-2,其中x=-1
先化简在求值(x-1/3x-x+1/x)*x/x²-1,其中x=√2-3
先化简,在求值(2x/x-3-x/x+3)×x^2-9/x,其中x=1