1、(1/20+1/30)x+1/20*18-x=1 2、(7x-30)/(3+30)=3/2
4(x+3)=2x+2 7(x-1)=2x+3 4x+20=6x-30 4x-12=2x 2x-3=x+7 3x-4=2
计算:(x+1)x=7 (x-1)(x+2)=30 (3-x)(3-x)+x=9
x/2+x/6+x/12+x/20+x/30+x/42=1
x-10=4(x-28) 3(x-28)=x+56+28 2(1.5x-30-20)=x 2(2x-20-45)=x-1
(X-X*20%-18-(X-X*20%-18)*10%=X*1/2-3(过程)
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x
(2x-1)/(x-1)(x-2)=(x-5)/(x-2)(x-3) x/2x^2-11x-21=(x+7)/x^2-1
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
求x^2-3x/x^2-6x+9*x^2-11x+30/x^2-5x-1
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
已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^+x^6+x^7+x^8的值