18.5x+26-46.01=0.4x

（X+X)+(X-X)+(X*X)+(X/X)=100 X-0.4X=36 0.2x+0.4x=12 x=?20x+x=420 x=? 4+5/1x=26 x-6/1x=8/3 x-0.4x=45 3/2x+ x+x=x+15 若x³+x²+x+1=0,则x^-27+x^-26+……+x^-1+1+x+x²+……+x 3X-18=13.2 1.5X-X=6 4X+1.2X=26 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!)+. 方程x-0.4x+360:x=3: 0.4x+3.2=2.5x+0.05 X是多少 x-1/5x-(1/5x-2)=26 2x+0.4x=48(并检验) 8x-x=14.7 35x+13x=9.6