512/3÷5/3+713/4÷7/4+914/5÷9/5.

问题描述:

51

2
3
÷
5
3
+71
3
4
÷
7
4
+91
4
5
÷
9
5

51

2
3
÷
5
3
+71
3
4
÷
7
4
+91
4
5
÷
9
5

=(50+
5
3
)×
3
5
+(70+
7
4
)×
4
7
+(90+
9
5
)×
5
9

=50×
3
5
+
5
3
×
3
5
+70×
4
7
+
7
4
×
4
7
+90×
5
9
+
9
5
×
5
9

=30+1+40+1+50+1
=123.