6x-3x=18 1.5x+18=3x
已知 X=4- 根号3 求 (X*X*X*X-6X*X*X-2X*X+18X+23) / (X*X-8X+15)的值
3X-18=13.2 1.5X-X=6 4X+1.2X=26
计算1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=?
1/x(x+3)+1/(x+3)(x+6)+1/(x+6)(x+9)=3/2x+18
X(x+3)分之一+(X+3)(X+6)分之一+(X+6)(X+9)分之一=2x+18分之三
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
6x-3x=18 1.5x+18=3x
6X=3(18+x)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!)+.
2x+3x+4x+5x+x+6x+7x=100
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
若x^2-8x+13=0求(x^4-6x^3-2x^2+18x+23)