问题 解答题
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
答案

(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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