计算:411/3×3/4+511/4×4/5+611/5×5/6=_.

问题描述:

计算:41

1
3
×
3
4
+51
1
4
×
4
5
+61
1
5
×
5
6
=______.

41

1
3
×
3
4
+51
1
4
×
4
5
+61
1
5
×
5
6

=(40+
4
3
3
4
+(50+
5
4
4
5
+(60+
6
5
5
6

=40×
3
4
+
4
3
×
3
4
+50×
4
5
+
5
4
×
4
5
+60×
5
6
+
6
5
×
5
6

=30+1+40+1+50+1,
=123.
故答案为:123.