5x/(x+3)(x+2)+2x-5/(x-4)(x+3)=7x-70/(x+2)(x+4)
5x/(x+3)(x+2)+(2x-5)/(x-4)(x+3)=(7x-70)/(x+2)(x+4)
300+x=3X(70+x)解方程
5X+6(X+10)+10(X+30)+6(X+70)+3(X+150)=2730,X等于多少
(X-1)(X-2)=70,(3-X)²+2X(X-1)=0,-3X²-4X+4=0,(3-X)
3x+70
{5x-3(20-x)≥70,5x-3(20-x)≤90
20*X+30*3X+70*(50-X-3X)=1800
(x^x-(sinx)^x)/x^3极限
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-1)(X-2)(x-3)...(x-50)+x(x-2)(X-3)...(X-50)+...+x(x-1)(x-2)
(x的次方+2x+4)(x的平方+2x+2)-35 x的3次方+6x的平方+11x+6 x的3次方-39x-70