题目内容
计算(能简算的要简算)
(1)
×(
×7)
(2)72×
-
(3)4-
×
(4)
×
+
×
.
(1)
| 1 |
| 7 |
| 19 |
| 27 |
(2)72×
| 5 |
| 9 |
| 1 |
| 4 |
(3)4-
| 5 |
| 12 |
| 4 |
| 12 |
(4)
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 3 |
| 1 |
| 2 |
(1)
×(
×7),
=(
×7)×
,
=
;
(2)72×
-
,
=40-
,
=39
;
(3)4-
×
,
=4-
,
=3
;
(4)
×
+
×
,
=
×(
+
),
=
×
,
=
.
| 1 |
| 7 |
| 19 |
| 27 |
=(
| 1 |
| 7 |
| 19 |
| 27 |
=
| 19 |
| 27 |
(2)72×
| 5 |
| 9 |
| 1 |
| 4 |
=40-
| 1 |
| 4 |
=39
| 3 |
| 4 |
(3)4-
| 5 |
| 12 |
| 4 |
| 12 |
=4-
| 5 |
| 36 |
=3
| 31 |
| 36 |
(4)
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 3 |
| 1 |
| 2 |
=
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 2 |
=
| 1 |
| 3 |
| 4 |
| 3 |
=
| 4 |
| 9 |
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