5x+(15-x)=35
15-(4-5x)=2x+(35-3x)
18%x+32%x=2 x+20%x=2.4 x+5%x=4.2 15%x+35%x=0.2
35(X-2)+15(5X-6)=(22X-51)+21(3X-4)
35(x-2)-15(5x-6)=(22x-63)-21(3x-4)咋算?
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!)+.
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
解方程:x/3+x/15+x/35+x/63+x/99=1
5x+15/x^2+x-6=A/x-2+B/x-3
∫(x^4-4x^2+5x-15)/(x^2+1)(x-2) dx=?
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