问题 解答题
计算,能简算的要写出简算过程.
24×(
13
8
-
3
12
45×
3
8
+56×37.5%-0.375
[1-(
1
4
+
3
8
)]÷
3
4
13
19
-
3
13
+
25
19
-
10
13
3
8
×8÷
3
5
×5
13
18
×(
9
18
×17+
9
18
答案

①24×(

13
8
-
3
12
),

=24×
13
8
-24×
3
12
=39-6,

=33.

②45×
3
8
+56×37.5%-0.375,

=45×0.375+56×0.375-0.375,

=0.375×(45+56-1),

=0.375×100,

=37.5;

③[1-(

1
4
+
3
8
)]÷
3
4

=[1-

5
8
3
4

=

3
8
×
4
3

=

1
2

13
19
-
3
13
+
25
19
-
10
13

=

13
19
+
25
19
-
3
13
-
10
13

=

13
19
+
25
19
-(
3
13
+
10
13
),

=2-1,

=1;

3
8
×8÷
3
5
×5,

=

3
8
×8×
5
3
×5,

=25;

13
18
×(
9
18
×17+
9
18
),

=

13
18
×[
9
18
×(17+1)],

=

13
18
×[
9
18
×18],

=

13
18
×9,

=

13
2

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