题目内容

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.
(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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