[3x(2x²+4x)-5x(x²-2x)]÷(-x²)等于多少,
(2x-6)/(x²-4x)/(X+3)*( x²+x-6)/(3-x)等于多少?
[3x(2x²+4x)-5x(x²-2x)]÷(-x²)等于多少,
求解(x²-4/x²-4x+4 +2-x/x+2)除以x/x-2等于多少
-x(x²-x)等于多少?
lim(x→∞)(根号4x²-3x+2)/2x等于多少?
[(x+2)/(x²+2x)-(x-1)/(x²-4x+4)]÷(x-4)/x
/x+2/+/x-3/+/x-4/+/x-5/ 等于多少? (/x+2/ 的意思是x+2的绝对值)
2x^6×x³-3x^9+5x²×x^7等于多少
(-3x²)(-x²+2x-1) 等于?
x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少?
先化简再求值:(x+2/x²-2x - x-1/x²-4x+4)÷ x-4/x,其中x=3/2
(-x+2x²+5)+(4x²-3-6x)等于多少