题目内容

计算下列各题(能简算的写出简算过程)
①
1
8
+
5
7
+6.875+
2
7
;
②
7
9
÷
11
5
+
2
9
×
5
11
;
③
1
3
÷(
2
3
-
2
5
)×
3
5

④[
1
2
-(
3
4
-
3
5
)]÷
7
10
.
(1)
1
8
+
5
7
+6.875+
2
7

=(
1
8
+6
7
8
)+(
5
7
+
2
7
),
=7+1,
=8;
(2)
7
9
÷
11
5
+
2
9
×
5
11

=
7
9
×
5
11
+
2
9
×
5
11
,
=(
7
9
+
2
9
)×
5
11
,
=1×
5
11
,
=
5
11
;
(3)
1
3
÷(
2
3
-
2
5
)×
3
5

=
1
3
÷
4
15
×
3
5
,
=
1
3
×
3
5
÷
4
15
,
=
1
5
×
15
4
,
=
3
4
;
(4)[
1
2
-(
3
4
-
3
5
)]÷
7
10

=[
1
2
-
3
20
]÷
7
10
,
=
7
20
×
10
7
,
=
1
2
.
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