问题 解答题
脱式计算:
306×15-2080
9
10
-
1
3
÷
1
2
+
5
6

3.5×(20.6-16.8÷4.8)
(
7
9
+
2
3
×
5
6
4
15

4
5
×[7-4÷(
2
15
+
2
3
)]
答案

(1)306×15-2080

=4590-2080,

=2510;

(2)

9
10
-
1
3
÷
2
3
+
5
6

=

9
10
-
1
2
+
5
6

=

37
30

(3)3.5×(20.6-16.8÷4.8)

=3.5×(20.6-3.5),

=3.5×17.1,

=59.85;

(4)(

7
9
+
2
3
×
5
6
)÷
4
15

=(

7
9
+
5
9
)÷
4
15

=

4
3
×
15
4

=5;

(5)

4
5
×[7-4÷(
2
15
+
2
3
)]

=

4
5
×[7-4×
15
12
],

=

4
5
×[7-5],

=

4
5
×2,

=

8
5

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