题目内容

脱式计算:
1-
7
9
÷
7
8

5
3
-(
2
5
+
3
4
)〕÷
3
4

5
7
-
5
7
×
1
5

1-
7
9
÷
7
8

=1-
7
9
×
8
7

=1-
8
9

=
1
9

5
3
-(
2
5
+
3
4
)〕÷
3
4

=(
5
3
-
2
5
-
3
4
)×
4
3

=
5
3
×
4
3
-
2
5
×
4
3
-
3
4
×
4
3

=
20
9
-
8
15
-1,
=
55
45
-
24
45

=
31
45

5
7
-
5
7
×
1
5

=5×
7
5
-
1
7

=7-
1
7

=6
6
7
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