先化简（1/x-1-1/x+1）÷x/2x²-2,然后选取一个你认为合适的数作为x值带入求值.已知a/2=b/3≠0,求代数式5a-2b/a²-4b²×(a-2b)的值

*-----------------------------------------------*| 6 4 X | 8 X X | X X 5 || X X X | X X X | X 7 8 || X X X | X X X | X X X ||---------------+---------------+--------------- || X X X | X X X | 5 1 X || X X X | X 6 X | X X X || 8 X X | 3 5 X | 2 X X || 填九宫格帮帮忙.x x 6 x x 7 x x 98 x x x 3 x 1 x x 9 x x 6 x 5 x 3 x x x 3 x x x x 1 8x x x 9 x 1 x x x2 1 x x x x 6 x x x 6 x 7 x 3 x x 1 x x 9 x 2 x x x 47 x x 8 x x 5 x x 先化简.在求值:（x+2/x²-2x-x-1/x²-4x+4）÷x²-16/x²+4x 七年级下册政治复习提纲(山东人民出版社)第五单元是 青春的脚步 青春的气息别弄错了啊!格式：X X X X X X X X X 1、X X X X X X X X X X.2、X X X X X X X X X.3、X X X X X X X X X X X. [（x+2）/(x²+2x)-(x-1)/(x²-4x+4)]÷(x-4)/x 分解因式----（X*X-X)(X*X-X-2)+1 x-1/x÷(x-1/x) 】x(x+1)+x^2(x-1) 先化简,再求值(x²+x+1分之x²-4)÷(x³+x²+x分之x³-2x²)²乘以（x+2）³分之x,其中x²+2x-2=0. 1/(1-x)+1/(1+x)+2/(1+x*x)+4/(1+x*x*x*x)+8/(1-x*x*x*x*x*x*x*x)怎么做 化简(x^2-2x+1)/(x^2+1)÷(x-1)/(x^2+x)-x [x^2+2x-8/x^3+2x^2+x]÷[(x-2/x)×(x+4/x+1)]化简[x^2+2x-8/x^3+2x^2+x]÷[(x-2/x)×(x+4/x+1)]化简 计算：（1+1/x）·x²-2x+1/x²-1；（x²/x-1-2x/1-x）÷x/x-1. 解九宫格题目（X为未知数）9 X 2 X 7 X 8 X XX X 4 X X 9 X 6 X1 3 X 5 X X X X 24 X X 8 5 X X 1 XX 8 9 4 X 1 6 7 XX 1 X X 3 6 X X 88 X X X X 2 X 3 6X 5 X 6 X X 9 X XX X 7 X 4 X 2 X 1 【{x²-4x+4/x²-4}-x/x+2】÷x-1/x+2 请问这道题咋做 ：（x）X (x+1) X (x+2) X (x+3) =360 先化简,再求值(2x-6)/(4-4x+x^2)÷ (x+3)× (x^2+x-6）/(3-x),其中x=-1/2 先化简 再求值 x^2-1/x^2-2x+1÷x+1/x-1×1-x/1+x