问题
解答题
化简分式:(x+
|
答案
令
=a,则x2+x+1 x
=(x+1 x2
)2-2=a2-2.1 x
原式=a2-(a-
)2÷1 1-a a2-2-a+3 a2-2-2a+3
=a2-(
)2÷a2-a+1 a-1 a2-a+1 (a-1)2
=a2-(a2-a+1)
=a-1
=x+
-1=1 x
.x2-x+1 x
化简分式:(x+
|
令
=a,则x2+x+1 x
=(x+1 x2
)2-2=a2-2.1 x
原式=a2-(a-
)2÷1 1-a a2-2-a+3 a2-2-2a+3
=a2-(
)2÷a2-a+1 a-1 a2-a+1 (a-1)2
=a2-(a2-a+1)
=a-1
=x+
-1=1 x
.x2-x+1 x