【1-2/1x2/1 】x【1-3/1x3/1】x【1-4/1x4/1】.【1-2005/1x2005/1】=
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【1-2/1x2/1】x【1-3/1x3/1】x【1-4/1x4/1】.【1-2005/1x2005/1】=【1-2/1x2/1】x【1-3/1x3/1】x【1-4/1x4/1】.【1-2005/1x
【1-2/1x2/1 】x【1-3/1x3/1】x【1-4/1x4/1】.【1-2005/1x2005/1】=
【1-2/1x2/1 】x【1-3/1x3/1】x【1-4/1x4/1】.【1-2005/1x2005/1】=
【1-2/1x2/1 】x【1-3/1x3/1】x【1-4/1x4/1】.【1-2005/1x2005/1】=
平方差
=(1-1/2)(1+1/2)(1-1/3)(1+1/3)……(1-1/2005)(1+1/2005)
=(1/2)(3/2)(2/3)(4/3)……(2004/2005)(2006/2006)
=(1/2)(2006/2005)
=1003/2005
3/x2 -3x+2-1/x-2=1/x2 -x+4/x2 -2x
通分 3x/x2-2x,2x+1/4-x2,3/2x2+4x
计算:x2-5x+6/x2-4x+3 + x2-4x+3/x2-2x+1 + x2-3x-4/1-x2
解方程:X2--1/8(X2+2X)+X2+2X/3(X2--1)=11
化简1/x2-3x+2 +1/x2-x +1/x2+x +1/x2+3x+2
2-3X/X2+X+1>3
2x-(3x-1)+2(x2)
(x-1)(x2-3x+2)
(x+1)(x2-x+1)+(x-2)(x2+2x+4),其中x=-3/2
化简x/x2+x除以x2+x-2/x2-1+x+1/x+2
先化简,再求值:(4x2-3x)-2(x2+2x-1)-(x2+x-1)
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
(X2-X)2+(X2+3X+2)2-4(X2+X+1)2因式分解
分解因式:4(3x2-x-1)(x2+2x-3)-(4x2+x-4)2
6x2-[-3x2-(x-1)] 化简
约分 1-x2/x2-3x-4
计算(x3+x2+x+2)/(x2+1)
x2+3x+9/x2-27+6x/9x-x2-x-1/6+2x 化简