解方程式(3x2-9x)/(x-4)=5+(2x-8)/(3x-x)
解方程:(x-8)/(x-3)-(x-9)/(x-4)=(x+7)/(x+8)-(x+2)/(x+3)
(1) x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8
(x-2)(x2-6x-9)-x(x-5)(x-3)其中x= -1/3
解方程 x(x-6)+2x(x-3)=3(x2-x-1) 解不等式:2x2(x-3)+4(x2-x)≥x(2x2-2x+
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
解一元二次方程,3x2+1=6x,4x2+5x=81,x(x+5)=0,(2x-2)(x-1)=0,x(x+5)=5x-
解方程:(x+3)/(x+2)-(x+5)/(x+4)=(x+7)/(x+6)-(x+9)/(x+8)
解方程(x-2)X(x的平方-6x-9)=x(x-5)X(x-3)
解方程(1)1/x-3+1/x+3=4/x2-9 (2)4/x2-2x+1/x=2/x-2
解方程:(x2-3x+2)(x2+3x-2)=x2(x+3)(x-3)
解关于x的不等式:(1)x(2x-5)>2x2-3x-4;(2)(x+1)(x+3)+8x>(x+5)(x-5)-2.