问题 解答题
用递等式计算,能简算的要简算.
4
9
÷(
5
6
-0.2)
10.5×(3.8-0.8)÷6.3
11
8
×17-17×
3
8

45×(
7
9
+
4
15
-
3
5
答案

(1)

4
9
÷(
5
6
-0.2),

=

4
9
÷(
5
6
-
1
5
),

=

4
9
÷
19
30

=

40
57

(2)10.5×(3.8-0.8)÷6.3

=10.5×3÷6.3,

=31.5÷6.3,

=5;

(3)

11
8
×17-17×
3
8

=(

11
8
-
3
8
)×17,

=1×17,

=17;

(4)45×(

7
9
+
4
15
-
3
5

=45×

7
9
+45×
4
15
-45×
3
5

=35+12-27,

=20.

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