题目内容
能简算的要简算.
×
×13×11
×
÷
×21+28×
+
×
.
10 |
11 |
1 |
13 |
4 |
9 |
9 |
14 |
4 |
21 |
13 |
49 |
13 |
49 |
1 |
5 |
2 |
9 |
3 |
10 |
(1)
×
×13×11,
=(
×11)×(
×13),
=10×1,
=10;
(2)
×
÷
,
=
×
,
=
;
(3)
×21+28×
,
=
×(21+28),
=
×49,
=13;
(4)
+
×
,
=
+
,
=
.
10 |
11 |
1 |
13 |
=(
10 |
11 |
1 |
13 |
=10×1,
=10;
(2)
4 |
9 |
9 |
14 |
4 |
21 |
=
2 |
7 |
21 |
4 |
=
3 |
2 |
(3)
13 |
49 |
13 |
49 |
=
13 |
49 |
=
13 |
49 |
=13;
(4)
1 |
5 |
2 |
9 |
3 |
10 |
=
1 |
5 |
1 |
15 |
=
4 |
15 |
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