5(x²+x-3)-4x(6+x)+x(-x+4)=0
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
3/x-1=4/x 6/x+1=x+5/x(x+1)
5(x²+x-3)-4x(6+x)+x(-x+4)=0
计算(x*x+4x+5)/(x+2)-(x*x+6x+10)/(x+3)+1
(x+4)(3x+6)=2x+4 (3x- 1)²+4x²=0 x²+5=2根号6x-1
6/(x+1)=(x+5)/[x(x+1)] (3-x)/(x-4)+1/(4-x)=1 2/(1+x)-3/(1-x)
5x-3(2x+1)=6x-4(5-3x)求x
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
x(x-14)二0*x平方十|2x十27=0,x平方=x+56,x(5x+4)=5x+4,4x平方-45=3|x,-3x
(2x-6)/(x²-4x)/(X+3)*( x²+x-6)/(3-x)等于多少?
(先化简后求值)(3x/x+2-x/x-2)+2x/x^2-4,x=4-根号5,
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