计算:x2-5x+6/x2-4x+3 + x2-4x+3/x2-2x+1 + x2-3x-4/1-x2
化简计算~1/(x2-5x+6) - 1/(4x-x2-3) - 1/(3x-x2-2)
5x2—[x2+(4x—x2)—2(x2—3x)]
1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=1/(x+4)
(x2+3x+9)/(x2-27)+(6x)/(9x-x2)-(x-1)/(6+2x)
解分式方程:2/x2+5x+6 + 3/x2+x-6=4/x2-4
5x2+4-3x2-5x-2x2-5+6x.
解方程2/x2+x+3/x2-x=4/x2-1
1/(x2+x)+1/(x2+3x+2)+1/(x2+5x+6)+1/(x2+7x+12)=4/21
(x2+1)2-4x(x2-1)因式分解 (x2-x)2+(x2+3x+2)2-4(x2+x+1)2因式分解
解方程:1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x
3x2-[7x-(4x-3)-2x2]
因式分解:(x2+2x+4)(x2+2x-3)-8