计算:1/(x+1)(x+2)+1/(x+2)(x+3)+1/(x+3)(x+4)+…+1/(x+100)(x+101)
问题描述:
计算:
+1 (x+1)(x+2)
+1 (x+2)(x+3)
+…+1 (x+3)(x+4)
1 (x+100)(x+101)
答
+1 (x+1)(x+2)
+1 (x+2)(x+3)
+…+1 (x+3)(x+4)
1 (x+100)(x+101)
=
-1 x+1
+1 x+2
-1 x+2
+…+1 x+3
-1 x+100
1 x+101
=
-1 x+1
1 x+101
=
.100 (x+1)(x+101)