题目内容

计算(能够简算的要简算)
5400-2940÷28
389×42.7+389×57.3(
1
9
+
1
27
)÷4+
23
27
1÷(0.75+
1
3
)×
13
24
1
3
+
3
8
+
2
3
+
5
8
.
(1)5400-2940÷28,
=5400-105,
=5400-(100+5),
=5400-100-5,
=5295;

(2)389×42.7+389×57.3,
=389×(42.7+57.3),
=389×100,
=38900;

(3)(
1
9
+
1
27
)÷4+
23
27
,
=
4
27
×
1
4
+
23
27
,
=
1
27
+
23
27
,
=
8
9
;

(4)1÷(0.75+
1
3
)×
13
24
,
=1÷(
3
4
+
1
3
)×
13
24
,
=1÷
13
12
×
13
24
,
=
12
13
×
13
24
,
=
1
2
;

(5)
1
3
+
3
8
+
2
3
+
5
8
,
=(
1
3
+
2
3
)+(
3
8
+
5
8
),
=1+1,
=2.
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