问题 解答题
用递等式计算.
4.8÷1.2-0.15
2
3
-
2
3
÷2
3
10
×(
5
7
-
10
21
1÷(
3
5
+
1
4
)×
17
19
答案

(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

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