求1/2x^2-1/4x+0.2x^3+0.25x-0.5x^2-1/5x^3+0.5x-1 其中x=12/13
0.25分之x-0.4分之x+1=0.2分之x-5-2
化简(2x-5)(3x+2)-6(x+1)(x-2),其中x=0.2
16+0.2x=0.25x十9求x!
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!)+.
3/5X-1/4X=7 8/11:10=4/5:X 3X-16×5=13 X:2/3=0.25:0.2
5x+0.2=3x+7.9
x+3/20x=46 ,x-1/5x=40 ,x-1/2x=3/4 ,x-0.2x=18解方程
18%x+32%x=2 x+20%x=2.4 x+5%x=4.2 15%x+35%x=0.2
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
解方程一.0.2x=0.25x-18 二.0.3x+x=69
解方程:5x+5=-0.25x(x+1)-0.25(x+1)-4.75