1,x:16=5:12 2.x:15=5:6
1x+2x+3x+4x+5x+6x+7x+8x+9x+10x+11x+12x+13x+14x+15x=550
解方程x/(x-2)=2x/(x-3)+(1-x)/(x-5x+6)
x/x-4 - 32/x的平方+16=1 x+1/x + 5X/x+1=6
已知3x*x-x=1,求6x*x*x+7x*x-5x+2000
1/6x+1/12x+1/7x+5+1/2x+4=x
1.3x的平方+5(2x+1) 2.x的平方-2x-15=0 3.7x(5x+2)=6(5x+2)
6/x+1=x-5/x^2+x
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10),
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值
解方程(x-6)(x^2+x+1)-x(x+1)(x-1)=x(2-5x)
解方程(x+1/x+2)-(x+2/x+3)=(x+5/x+6)-(x+6/x+7)