2.1X+7.9X=6.9 5X+0.8×2=7.12X+5.8=8.2 6X-3×4=1.2

2.1X+7.9X=6.9 5X+0.8×2=7.12X+5.8=8.2 6X-3×4=1.2 2.1X+7.9X=6.9 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!)+. 2.1X+7.9X=6.9解方程.5X+0.8乘2=7.3解方程 X+0.8X=? （X+X)+(X-X)+(X*X)+(X/X)=100 x-三分之一x-四分之一x(x-三分之一x)=5 x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 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. 7.9 x+1.58+x=6.9x-8.42解方程 x*x*x*x*x=80000? 解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6) (x+12)(x-2)+(x+7)(x+8)-(x+5)(x-10),其中x=2 x-2x+3x-4x+5x.+99x-100x=25求解 x.x-5x+1=0,那么x.x+1/x.x 2x+3x+4x+5x+x+6x+7x=100 x(x-2)-2x(x+1)-3x(x-5) 其中x=负½ (x-3/x-2)-(x-2/x-1)=(x-5/x4) -(x-4/x-3)