问题 解答题
计算,能简算的要简算.
43×
9
42
4
7
×
5
9
+
4
9
÷
7
4
2-
6
13
÷
9
26
-
2
3
8
9
+
4
7
÷
6
7
5
14
÷
4
21
×0.64
(0.75-
3
16
)×(
2
9
+
1
3
答案

(1)43×

9
42

=(42+1)×

9
42

=42×

9
42
+1×
9
42

=9+

9
42

=9

3
14

(2)

4
7
×
5
9
+
4
9
÷
7
4

=

4
7
×
5
9
+
4
9
×
4
7

=

4
7
×(
5
9
+
4
9
),

=

4
7
×1,

=

4
7

(3)2-

6
13
÷
9
26
-
2
3

=2-

6
13
×
26
9
-
2
3

=2-

4
3
-
2
3

=2-(

4
3
+
2
3
),

=2-2,

=0;

(4)

8
9
+
4
7
÷
6
7

=

8
9
+
4
7
×
7
6

=

8
9
+
2
3

=

14
9

=1

5
9

(5)

5
14
÷
4
21
×0.64,

=

5
14
×
21
4
×0.64,

=1.2;

(6)(0.75-

3
16
)×(
2
9
+
1
3
),

=

9
16
×
5
9

=

5
16

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