x-(x-140)×160%-1/6x=140请详写,还有一题5x-（120-x）×3.75=162.5

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, *-----------------------------------------------*| 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 || 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) (x/x-2)+(2/x*2+2x)-(x+6/x*2-4)化简,=x^2/x(x-2)+(2x-4)/x(x^2-4)-(x^2+6x)/x(x^2-4)=x^2/x(x-2)-(x+2)/x(x-2)=(x-2)(x+1)/x(x-2)=(x+1)/x x+2/x+1-x+4/x+3=x+6/x+5-x+8/x+7 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3x*x-x=1,求6x*x*x+7x*x-5x+2000 1.用公式计算：COSX=1-X*X/2!X*X*X*X/4!-X*X*X*X*X*X/6!.直到最后一项的绝对 X(X-1)=X x+[x+1/6x]+[x-1/6]=6 5x/x(1+x)=6/1+x 6/(x-1)-(x+2)/x(x-1)=0 [3/x]-[4/x-1]=6/x-x² [3/x]-[4/x-1]=6/x-x² (x+7)(x+6)-(x-2)(x+1)=? 4x^-4x+1=x^+6x+9 x平方-x+1=x平方-x分之6