化简分式:1/x2+3x+2+1/x2+5x+6+1/x2+7x+12.
问题描述:
化简分式:
+1
x2+3x+2
+1
x2+5x+6
. 1
x2+7x+12
答
原式=
+1 (x+1)(x+2)
+1 (x+2)(x+3)
1 (x+3)(x+4)
=(
-1 x+1
)+(1 x+2
-1 x+2
)+(1 x+3
-1 x+3
)1 x+4
=
-1 x+1
1 x+4
=
.3
x2+5x+4