8X-2X=42

x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, x/x-2+x-9/x-7=x+1/x-1+x-8/x-6, x/x-2 - 8/x²-4 =1/x+2x/x-2 - 1=1/x²-42/x²-1 - 1/x-1=1 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? x/2+x/6+x/12+x/20+x/30+x/42+x/56=7/8 其中x未知数,求x,要求简便. 4x+2x+8x+7x=42 x=? (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 x-4/1x=8/3 x-0.8x=22 3/2x+2/1x=42x-4/1x=8/3 x-0.8x=22 3/2x+2/1x=42 x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=? 解方程(x/x(x+2))+(x/(x+2)(x+4))+.+x/(x+8)(x+10)=1 X(x平方-6x-9)-x(x平方-8x-15)+2x(3-x)其中x=-六分之一 x^2+8x+ =(x+ )^2 x(x-4)=2-8x x-4/1x=8/3 x-0.8x=22.3/2x+2/1x=42 8x-2x=42 8X-2X=42 (x+1)/(x+2)+(x+8)/(x+9)解答x+1/x+2+x+8/x+9=x+2/x+3+x+7/x+8 *-----------------------------------------------*| 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 ||