试题与答案

能简算的要简算.1011×113×13×1149×914÷4211349×21+

题型:解答题

题目:

能简算的要简算.
10
11
×
1
13
×13×11
4
9
×
9
14
÷
4
21

13
49
×21+28×
13
49

1
5
+
2
9
×
3
10

答案:

(1)

10
11
×
1
13
×13×11,

=(

10
11
×11)×(
1
13
×13),

=10×1,

=10;

(2)

4
9
×
9
14
÷
4
21

=

2
7
×
21
4

=

3
2

(3)

13
49
×21+28×
13
49

=

13
49
×(21+28),

=

13
49
×49,

=13;

(4)

1
5
+
2
9
×
3
10

=

1
5
+
1
15

=

4
15

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