x+x=x+15

x+x=x+15 （X+X)+(X-X)+(X*X)+(X/X)=100 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 X/15 + X/12 + X/10 = 1365,求X, (25/X)X(30/X)= 15/X怎么算 计算1/[x(x+3)]+1/[(x+3)(x+6)]+.+1/[(x+15)(x+18)]=? 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 |x| x ，x