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 +

2025-03-06 19:07:59
推荐回答(1个)
回答1:

(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