题目内容
用简便方法计算下面各题.
×
×
×72-
×23
+
×16
(
+
)×24
×5×
×3+
×6+
.
| 17 |
| 12 |
| 5 |
| 34 |
| 3 |
| 4 |
| 5 |
| 7 |
| 5 |
| 7 |
| 14 |
| 17 |
| 14 |
| 17 |
(
| 1 |
| 4 |
| 1 |
| 6 |
| 1 |
| 8 |
| 8 |
| 9 |
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
(1)
×
×
,
=
;
(2)
×72-
×23,
=
×(72-23),
=
×49,
=35;
(3)
+
×16,
=
×(1+16),
=14;
(4)(
+
)×24,
=
×24+
×24,
=6+4,
=10;
(5)
×5×
,
=
;
(6)
×3+
×6+
,
=
×(3+6+1),
=
×10,
=12.
| 17 |
| 12 |
| 5 |
| 34 |
| 3 |
| 4 |
=
| 5 |
| 32 |
(2)
| 5 |
| 7 |
| 5 |
| 7 |
=
| 5 |
| 7 |
=
| 5 |
| 7 |
=35;
(3)
| 14 |
| 17 |
| 14 |
| 17 |
=
| 14 |
| 17 |
=14;
(4)(
| 1 |
| 4 |
| 1 |
| 6 |
=
| 1 |
| 4 |
| 1 |
| 6 |
=6+4,
=10;
(5)
| 1 |
| 8 |
| 8 |
| 9 |
=
| 5 |
| 9 |
(6)
| 6 |
| 5 |
| 6 |
| 5 |
| 6 |
| 5 |
=
| 6 |
| 5 |
=
| 6 |
| 5 |
=12.
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