问题 解答题
简便计算:
10
11
×
1
13
×13×11;
2
5
+
3
10
)×
10
3

13
49
×21+28×
13
49

17
21
×
3
4
+
8
21
×
3
4
-
3
4

3
4
+
5
8
)×8×4;
34÷35×36;
8
11
×
7
25
+
7
11
×
3
25
答案

10
11
×
1
13
×13×11,

=

10
11
×11×
1
13
×13,

=10×1,

=10;

2
5
+
3
10
)×
10
3

=

2
5
×
10
3
+
3
10
×
10
3

=1

1
3
+1,

=2

1
3

13
49
×21+28×
13
49

=(21+28)×

13
49

=49×

13
49

=13;

17
21
×
3
4
+
8
21
×
3
4
-
3
4

=(

17
21
+
8
21
-1)×
3
4

=

4
21
×
3
4

=

1
7

3
4
+
5
8
)×8×4,

=

3
4
×4×8+
5
8
×8×4,

=24+20,

=44;

34÷35×36,

=

34
35
×(35+1),

=

34
35
×35+
34
35
×1

=34+

34
35

=34

34
35

8
11
×
7
25
+
7
11
×
3
25

=

7
11
×
8
25
+
7
11
×
3
25

=

7
11
×(
8
25
+
3
25
),

=

7
11
×
11
25

=

7
25

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