(x2+5x+5)/(x2+5x+6)-(x2+8x+14)/(x2+8x+15)化简
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(x2+5x+5)/(x2+5x+6)-(x2+8x+14)/(x2+8x+15)化简(x2+5x+5)/(x2+5x+6)-(x2+8x+14)/(x2+8x+15)化简(x2+5x+5)/(x2+
(x2+5x+5)/(x2+5x+6)-(x2+8x+14)/(x2+8x+15)化简
(x2+5x+5)/(x2+5x+6)-(x2+8x+14)/(x2+8x+15)
化简
(x2+5x+5)/(x2+5x+6)-(x2+8x+14)/(x2+8x+15)化简
(x2+5x+5)/(x2+5x+6)-(x2+8x+14)/(x2+8x+15)
=(x2+5x+6-1)/(x2+5x+6)-(x2+8x+15-1)/(x2+8x+15)
=1-1/(x2+5x+6)-1+1/(x2+8x+15)
=1/(x2+8x+15)-1/(x2+5x+6)-
(x2+5x+5)/(x2+5x+6)-(x2+8x+14)/(x2+8x+15)
=(x²+5x+6-1)/(x²+5x+6)-(x²+8x+15-1)/(x²+8x+15)
=1-1/(x²+5x+6)-1+1/(x²+8x+15)
=-1/[(x+2)(x+3)]+1/[(x+3)(x+5)]
=-1/(x+2)+1/(x+3)+1/2[1/(x+3)-1/(x+5)]
=-1/(x+2)+3/[2(x+3)]-1/[2(x+5)]
x2-5x+6
x2-5x+6
x2-1/x2-5x+6
5(x2-x)=3(x2+x)
计算:x2-5x+6/x2-4x+3 + x2-4x+3/x2-2x+1 + x2-3x-4/1-x2
(x2+5x-4)(x2+5x+6)-120 因式分解
5x2-8x+5-3x2+6x
用换元法解方程x2-3x+5+6/(x2-3x)
x2-5x-6因式分解
不等式｜x2-5x+6｜
(x2+5x+5)/(x2+5x+6)-(x2+8x+14)/(x2+8x+15)化简
x2-5x+8
3x2+5x
解方程：1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x2+11x-708解方程：1/x2+x +1/x2+3x+2 +1/x2+5x+6 +1/x2+7x+12 +1/x2+9x+20=5/x2+11x-708
不等式(x2-4x-5)(x2-8)
(1-x2)(x2-4x+5)
不等式（x2-4x-5)(x2+1)
x2-5x+1=0则x2+x2/1