7x-3.

3道简单的分式方程,1.3/(1-x^) = 2/(1+2x+x) - 5/1-2x+x^2.5x/(x^+x-6) + (2x-5)/(x^-x-12) = (7x-10)/(x^-6x+8)3.(x+1)/(x+2) + (x+6)/(x+7) = (x+2)/(x+3) + (x+5)/(x+6) 1.x²-2x-3 2.x²-5x-6 3.x²-9x-10 4.x²-9x-10 5.x²-2x-8 6.x²+2x-8 7.x²-x-12 8.x²+x-12 9.x²+6x-16 10.x²-14x-32 11.x²+7x-18 EXCEL两表间同时满足两个条件数据引用如题：表1为原始数据表1 2 3 4 5 6 7 8 9 10.A X X X X X X X X X XB X X X X X X X X X XC X X X X X X X X X XD X X X X X X X X X X .表2（A列） （B列） （C列）A 1A 3B 8B 5C 2D 3...... 1.(x*2-3x+3)/(x*2-3x+2)-(x*2-5x+7)/(x*2-5x+6)-1/(x*2-4x+3)2.1/x(x+1)+2/(x+1)(x+3)+3/(x+3)(x+6) 3.已知：x*2-3x+1=0,求x*2+1/x*2. 计算：1.6x-1/3x+2=5x-7/2x-5 2.2x/x-1=2/x+2=2 3.x-1/x+1-x/x-1=4/x²-1 1.x²-7x+122.x²+x-12 3.x²-4x-12 4.x²+10x-24 5.-x²-4x+216.(x-1)(x+4)-6用十字相乘法 4道不等式.快.1.(x-1)(x-2)+(x-2)(x-3)-2(x-3)(x-4)≤-42.（x-6）（x-9)-（x-7）（x-1)>7（2x-5）3.（x-6)（x-9）-（x-7）（x+1）≤7（2x-5）4.x（x-3） 如何解下列方程解下列方程 1. x/2x²-11x-21=x+7/x²-12x+35 2. x-4/x²+x-2=1/x-1+x-6/x²-4 3. 1/x+7=x+1/(2x-1)(x+7)+1/2x²-3x+1 1.x+9/x+8- x+10/x+9=x+6/x+5- x+7/x+6；2.x³+2/x²-x+1+ x³-9/x²+2x+4=2x-1；3.x-a-b/c+ x-b-c/a+ x-c-a/b=3.（空开的指另一个分式）第二题不用了。 *-----------------------------------------------*| 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 7x-3. 化简1.9x-9/4-4x 2.x^2-1/x^2+x-2 3.x^2-4x+4/2x-4 4.3x^2-9x-12/x^2+2x+1 5.x^2-7x+12/-x^2+9x-20 急6.xy-x-y+1/y^2-2y+1 题是九个未知数的方程式.5X = 6X = 7X = 8X = 10X = 13X = 14X = 17X = 23X == (X + X + X + X + X + X + X + X + X + 30)≤280提示：题中 5 后面的X是未知数1.6 后面的X是未知数2.7后面的X是未知数3.依次类推.题中（X + 做得好+++分1:x^2-7X+122:X^2+7X+103:(X+Y除4X+21)X+Y-------4X+214:(X^2-4除X^2+3X+2)X^2-4-------X^2+3X+2能说一下用什么方法做吗？3.是:(X+7除4X+28) 分解因式 1.x^3-3x^2-13x+15 2.2x^3-8x-3 3.x^4-2x^3-16x^2+2x+15 4.6x^-7xy-3y^2-19x-y+10 第一题x^3-3x^2-13x+15第二题 x^4-2x^3-16x^2+2x+15 第三题2x^3-3x^2-8x-3 分解因式 1.x²+2x-1 2.x²+4xy-4y² 3.(x²-2x)²-7(x²-2x)+12 用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.