(9x²-2x+7)-(x²+3x-2) =9x²-2x+7+x²-3x+2 =
f(x)=x²+3x|x-2|
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+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
不等式|(x+3)/x|>(x+3)/x,不等式(x²-9)/(x-2)>0
7x²-4x-3=0 -x²-x+12=0 x²-6x+9=0 (3x-2)²=
(x+1)(x+2)(x+3)x+1=0则3x²+9x+7
解方程(x²-2)+2x²(x+3)-3x-(5x-7)=x(3x²-9x+17)+2
9x+6x²-3(x-2/3x²),其中x=-2 1/4(-4x²+2x-8)-(1/2x
已知(x-2)(x²-6x-9)=x(x-5)(x-3),求6x的算术平方根
x²+3x+9/(x²-27)+6x/(9x-x²)-(x-1)/(6+2x)
4x²-{-3x²-[5x-x²-(2x²-x)]+4x},其中x=½