问题 解答题
灵活计算.
7
13
×
3
4
+
3
4
×
6
13
7
8
×0.375+
3
8
÷
8
9
1
6
-
5
54
)×54
12.5×0.32×25.
答案

(1)

7
13
×
3
4
+
3
4
×
6
13

=

3
4
×(
6
13
+
7
13
),

=

3
4
×1,

=

3
4

(2)

7
8
×0.375+
3
8
÷
8
9

=

7
8
×
3
8
+
3
8
×
9
8

=

3
8
×(
7
8
+
9
8
),

=

3
8
×2,

=

3
4

(3)(

1
6
-
5
54
)×54,

=

1
6
×54-
5
54
×54,

=9-5,

=4;

(4)12.5×0.32×25,

=12.5×8×0.04×25,

=12.5×8×(0.04×25),

=100×1,

=100.

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