7(x+18)=126

x-x/7=126 x=? 7(x+18)=126 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!)+. 78-7X=18-X,X=几 X^3-7X^2+18X-24=0 x^4-7x-18x=0 x+3/7x=18求x 0.75x-1/2x=-5;3x+5=4x+1;3X+5=4X+18;1-7x=x-7;9x+8-7x=3x;-(x-2 X+7分之3X=18 18-5x=7x+12 1/(x^2+7x)-1/(x^2+7x)+1/(x^2+7X+18)-1/(x^2+7X+12)=0 解方程 3.5 X—1.5 X=10.8 2.36 X+2.64 X=18 X—0.75 x=12 2.8 X+ X=7