题目内容

计算.(写出解答过程,能应简便方法的要用简便方法)
(1)28×
4
7
×
3
4
(2)(
3
4
-
2
5
)×40
(3)[12×(
1
2
-
1
3
)]÷
3
5
(4)
7
15
×
4
5
+
7
15
÷5.

(1)28×
4
7
×
3
4
,
=28×(
4
7
×
3
4
),
=28×
3
7
,
=12;

(2)(
3
4
-
2
5
)×40,
=
3
4
×40-
2
5
×40,
=30-16,
=14;

(3)[12×(
1
2
-
1
3
)]÷
3
5
,
=[12×
1
2
-12×
1
3
]÷
3
5
,
=[6-4]÷
3
5
,
=2÷
3
5
,
=
10
3
;

(4)
7
15
×
4
5
+
7
15
÷5,
=
7
15
×
4
5
+
7
15
×
1
5
,
=
7
15
×(
4
5
+
1
5
),
=
7
15
×1,
=
7
15
.
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