用递等式计算.4.8÷1.2-0.15 2÷ 2 3 - 2 3 ÷2 3 10 ×( 5

2025-02-23 05:15:19
推荐回答(1个)
回答1:

(1)4.8÷1.2-0.15,
=4-0.15,
=3.85;

(2)2÷
2
3
-
2
3
÷2,
=2×
3
2
-
2
3
×
1
2

=3-
1
3

=2
2
3


(3)
3
10
×(
5
7
-
10
21
),
=
3
10
×
5
7
-
3
10
×
10
21

=
3
14
-
1
7

=
1
14


(4)1÷(
3
5
+
1
4
)×
17
19

=1÷
17
20
×
17
19

=
20
17
×
17
19

=
20
19