x/(11-7)+x/(11+7)=13.2/60怎么求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!)+.
已知2x*x+x-5=0,求代数式6x*x*x+7x*x-13x+11的值
15-(7-5x)=2x+(11-3x)求x等于几
5x^3+7x^2-11x+3=0 求X
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1
x-4/x-5 - x-5/x-6=x-7/x-8 - x-8/x-9求x=?
已知3x*x-x=1,求6x*x*x+7x*x-5x+2000
解方程:5x(x+7)(x+4)=5x(x的平方+11x)
5x(x+7)(x+4)=5x(x^2+11X)
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
(100-x):(80+x)=7:11 怎么解
7x/11=6-x/33怎么计算