题目内容
| 计算下面各题,能简算的要简算. (
|
36×(
|
| ||||||||||||||
|
|
(3-
|
分析:(1)(2)(3)(6)运用乘法分配律简算;
(4)约分计算;
(5)先算括号内的,再算括号外的.
(4)约分计算;
(5)先算括号内的,再算括号外的.
解答:解:(1)(
+
)×
,
=
×
+
×
,
=
+
,
=
;
(2)36×(
-
),
=36×
-36×
,
=12-4.5,
=7.5;
(3)
×11+
,
=
×(11+1),
=
×12,
=7;
(4)
×
×
,
=
×
,
=
;
(5)
×(
+
),
=
×
,
=
;
(6)(3-
)×17,
=3×17-
×17,
=51-
,
=50
.
| 5 |
| 12 |
| 3 |
| 8 |
| 8 |
| 15 |
=
| 5 |
| 12 |
| 8 |
| 15 |
| 3 |
| 8 |
| 8 |
| 15 |
=
| 2 |
| 9 |
| 1 |
| 5 |
=
| 19 |
| 45 |
(2)36×(
| 1 |
| 3 |
| 1 |
| 8 |
=36×
| 1 |
| 3 |
| 1 |
| 8 |
=12-4.5,
=7.5;
(3)
| 7 |
| 12 |
| 7 |
| 12 |
=
| 7 |
| 12 |
=
| 7 |
| 12 |
=7;
(4)
| 7 |
| 8 |
| 3 |
| 49 |
| 8 |
| 9 |
=
| 3 |
| 56 |
| 8 |
| 9 |
=
| 1 |
| 21 |
(5)
| 8 |
| 35 |
| 1 |
| 4 |
| 1 |
| 3 |
=
| 8 |
| 35 |
| 7 |
| 12 |
=
| 2 |
| 15 |
(6)(3-
| 1 |
| 51 |
=3×17-
| 1 |
| 51 |
=51-
| 1 |
| 3 |
=50
| 2 |
| 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进行简便计算.
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