X+13%X-28%X=3.
X+13%X-28%X=3.
x+13%x-28%x=3.4
(X+X)+(X-X)+(X*X)+(X/X)=100
X+13%X-28%X=3.4方程怎么解?
4x+9x=13x
x 13%-28%x=3.4
13x-6.3x+x=46.8 x=多少
解方程((13x-x^2)/(x+1))(x+(13-x)/(x+1))=42
(13x-x^2)/(x+1)[x+(13-x)/(x+1)]=42
x+x=x+15
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
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!)+.