(100-x)*3*(1 2x%)300怎么算

y+(1+x)(2+x)(3+x)导数怎么算, (X-3)/(X^2-4)*(X^2-4X+4)/(x^2-x-6)-1/(x+2)怎么算? 1/x(x+1)+1/(x+1)(x+2)+1/(x+2)(x+3)化简怎么算? (3x-300)(3x-100)=1这道题怎么算?x=? 2(x的平方-3x+1)-(3x-3-x的平方）怎么算? (2x+1)²-(x+3)(3-x)=6x怎么简便算? lim(x→0)[（3x+1)/(4x-2)]^1/x 这道题怎么算极限 lim(x→0)(x^2+cosx-2)/(x^3)*ln(1+x)怎么算 1+x+x^2+x^3+.+x^99+x^100 2x*3x该怎么算 2x^-X-3因式分解怎么算 2x+4>3x怎么算