化简:(1)11x2+4x-1-x2-4x-5
(x2+5x+4)2+2(x2+5x+4)2+1=(x2+.
化简:根号(x2+6x+9)+根号(x2-2x+1)-根号(x2-4x+4)
分式计算:2x/x2-x-2÷(1-x/x+1)-x2+2x/x2-4
1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=1/(x+4)
证明:根号(x2+2x+4)-根号(x2-x+1)
x2次方-4(x-1) x2次方-4X-4中x2次方-4X相不减不减
化简计算~1/(x2-5x+6) - 1/(4x-x2-3) - 1/(3x-x2-2)
证明:(x3+5x2+4x-1)-(-x2-3x+2x3-3)+(8-7x-6x2+x3)的值与x无关.
1/(x2+x)+1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=4/21
x2-5x+1=0则x2+x2/1
解方程2/x2+x+3/x2-x=4/x2-1
(-2x2+3x)-[5x-(2x2+1)-x2].