题目内容
| 计算下面各题. (
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分析:(1)运用乘法分配律简算;
(2)(5)先算乘法,再算加法;
(3)(6)运用乘法结合律简算;
(4)先算括号内的,再算括号外的.
(2)(5)先算乘法,再算加法;
(3)(6)运用乘法结合律简算;
(4)先算括号内的,再算括号外的.
解答:解:(1)(
+
)×36,
=
×36+
×36,
=27+28,
=55;
(2)
+
×
,
=
+
,
=
;
(3)
×
×14,
=
×(
×14),
=
×6,
=
;
(4)
×(
-
),
=
×
,
=
;
(5)
+
×
,
=
+
,
=
;
(6)
×
-
×
,
=
×(
-
),
=
×
,
=
.
| 3 |
| 4 |
| 7 |
| 9 |
=
| 3 |
| 4 |
| 7 |
| 9 |
=27+28,
=55;
(2)
| 1 |
| 4 |
| 2 |
| 3 |
| 1 |
| 2 |
=
| 1 |
| 4 |
| 1 |
| 3 |
=
| 7 |
| 12 |
(3)
| 13 |
| 15 |
| 3 |
| 7 |
=
| 13 |
| 15 |
| 3 |
| 7 |
=
| 13 |
| 15 |
=
| 26 |
| 5 |
(4)
| 1 |
| 2 |
| 5 |
| 6 |
| 2 |
| 3 |
=
| 1 |
| 2 |
| 1 |
| 6 |
=
| 1 |
| 12 |
(5)
| 5 |
| 7 |
| 2 |
| 7 |
| 1 |
| 2 |
=
| 5 |
| 7 |
| 1 |
| 7 |
=
| 6 |
| 7 |
(6)
| 2 |
| 3 |
| 3 |
| 4 |
| 2 |
| 3 |
| 1 |
| 4 |
=
| 2 |
| 3 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 2 |
| 3 |
| 1 |
| 2 |
=
| 1 |
| 3 |
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
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