2000/x-5-1800/x＝0.25

2000/x-5-1800/x＝0.25 [2000/(x-5)]-1800/x怎么算 已知3x*x-x=1,求6x*x*x+7x*x-5x+2000 10x＝5+x x+5x＝150 已知3x－x＝1,求6x＋7x－5x＋2000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 已知x*x-5x-2000=0,求((x-2)(x-2)(x-2)-(x-1)(x-1)+1)/x-2的值 解方程x-3x+5x-7x……-1999x=2000 x(2x－1)＝-3x(x+1)+5x²+3 x＋2/x＋1＝5/x－1/x(x＋1) 求化简! 混合运算6x+2x²-3x+x²+1其中x＝-5 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!)+. x+3/4x＝0.25(方程)x-2/5＝9/10(同样,方程) (-0.25)x(-2)x(-5/12)x(+0.8) 0.3(x+1)+0.25(100-x)=2/5x 1.5x＋5＝x＋30 x＝?