题目内容

计算:51
2
3
÷
5
3
+71
3
4
÷
7
4
-91
4
5
×
5
9
51
2
3
÷
5
3
+71
3
4
÷
7
4
-91
4
5
×
5
9

=51
2
3
×
3
5
+71
3
4
×
4
7
-91
4
5
×
5
9

=(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],
=31+41-51,
=72-51,
=21.
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