题目内容

计算下面各题,能简便计算的要简便计算.
①(7.5-4.5÷3)×1.4②
4
5
×
3
7
+
4
7
÷
5
4

11
8
-
7
11
×
5
7
-
6
11
2
9
÷[(
1
3
+
1
5
)×
5
8
].
(1)(7.5-4.5÷3)×1.4,
=(7.5-1.5)×1.4,
=6×1.4,
=8.4;

(2)
4
5
×
3
7
+
4
7
÷
5
4

=
4
5
×(
3
7
+
4
7
),
=
4
5
×1,
=
4
5


(3)
11
8
-
7
11
×
5
7
-
6
11

=
11
8
-
5
11
-
6
11

=
11
8
-(
5
11
+
6
11
),
=
11
8
-1,
=
3
8


(4)
2
9
÷[(
1
3
+
1
5
)×
5
8
],
=
2
9
÷[
8
15
×
5
8
],
=
2
9
÷
1
3

=
2
3
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