题目内容

脱式计算:
1-
7
9
÷
7
8

〔
5
3
-(
2
5
+
3
4
)〕÷
3
4

5÷
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÷
5
7
-
5
7
×
1
5
,
=5×
7
5
-
1
7
,
=7-
1
7
,
=6
6
7
.
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