题目内容
计算下列各题,能简算的要简算.
(
|
| 3-
|
(1)(
+
-
)×72,
=
×72+
×72-
×72,
=30+8-27,
=38-27,
=11;
(2)
÷7+
×
,
=
×
+
×
,
=(
+
)×
,
=
×
,
=
;
(3)3-
×
-
,
=3-
-
,
=3-(
+
),
=3-1,
=2;
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=
| 5 |
| 12 |
| 1 |
| 9 |
| 3 |
| 8 |
=30+8-27,
=38-27,
=11;
(2)
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 6 |
| 13 |
=(
| 8 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
(3)3-
| 10 |
| 21 |
| 3 |
| 2 |
| 2 |
| 7 |
=3-
| 5 |
| 7 |
| 2 |
| 7 |
=3-(
| 5 |
| 7 |
| 2 |
| 7 |
=3-1,
=2;
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