1、0.92-7x=0.522、4.6x+2.3x=1.19

1、0.92-7x=0.522、4.6x+2.3x=1.19 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, 如果3x*x-x=1那么9x*x*x*x+12x*x*x-3x*x-7x+2001等于多少 x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 x=? 已知3x*x-x=1,求6x*x*x+7x*x-5x+2000 (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 已知x除以（x*x-x+1）=7,求x*x除以（x*x*x*x+x*x+1）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 (x+7)(x+6)-(x-2)(x+1)=? (x-2)(x+1)(x+4)(x+7)=19 (x+7)(x+5)-(x+1)(x+5)=42 X-5+8*X=7*X-2*X-1 (x-7)(x+3)+(x-1)(x+5)=102 （x-7)(x+3)+(x-1)(x+5)=102 7/x平方+x+1/x平方-x=0 （x-2)(x+1)(x+4)(x+7)=19