题目内容
简便计算.
×
×39
45×
+
×45
(
-
+
)÷
.
| 7 |
| 13 |
| 1 |
| 5 |
45×
| 1 |
| 7 |
| 6 |
| 7 |
(
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 24 |
(1)
×
×39,
=(
×39)×
,
=21×
,
=
;
(2)45×
+
×45,
=45×(
+
),
=45×1,
=45;
(3)(
-
+
)÷
,
=(
-
+
)×24,
=
×24-
×24+
×24,
=16-12+4,
=8.
| 7 |
| 13 |
| 1 |
| 5 |
=(
| 7 |
| 13 |
| 1 |
| 5 |
=21×
| 1 |
| 5 |
=
| 21 |
| 5 |
(2)45×
| 1 |
| 7 |
| 6 |
| 7 |
=45×(
| 1 |
| 7 |
| 6 |
| 7 |
=45×1,
=45;
(3)(
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
| 1 |
| 24 |
=(
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
=
| 2 |
| 3 |
| 1 |
| 2 |
| 1 |
| 6 |
=16-12+4,
=8.
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