题目内容
计算下面各题,能简算的要简算.
36×(
|
|
| ||||||||||||
(
|
48×
|
14×
|
分析:(1)根据乘法分配律进行简算;
(2)根据乘法分配律进行简算;
(3)根据乘法交换律进行简算;
(4)先算减法,再算乘法;
(5)先算乘法,再算减法;
(6)14=13+1,然后再根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)根据乘法交换律进行简算;
(4)先算减法,再算乘法;
(5)先算乘法,再算减法;
(6)14=13+1,然后再根据乘法分配律进行简算.
解答:解:
(1)36×(
+
),
=36×
+36×
,
=21+5,
=26;
(2)
×7+
,
=
×(7+1),
=
×8,
=3;
(3)
×5×
,
=
×
×5,
=
×5,
=
;
(4)(
-
)×
,
=
×
,
=
;
(5)48×
-
,
=18-
,
=17
;
(6)14×
,
=(13+1)×
,
=13×
+1×
,
=7+
,
=7
.
(1)36×(
| 7 |
| 12 |
| 5 |
| 36 |
=36×
| 7 |
| 12 |
| 5 |
| 36 |
=21+5,
=26;
(2)
| 3 |
| 8 |
| 3 |
| 8 |
=
| 3 |
| 8 |
=
| 3 |
| 8 |
=3;
(3)
| 4 |
| 7 |
| 7 |
| 8 |
=
| 4 |
| 7 |
| 7 |
| 8 |
=
| 1 |
| 2 |
=
| 5 |
| 2 |
(4)(
| 7 |
| 9 |
| 5 |
| 36 |
| 7 |
| 23 |
=
| 23 |
| 36 |
| 7 |
| 23 |
=
| 7 |
| 36 |
(5)48×
| 3 |
| 8 |
| 5 |
| 18 |
=18-
| 5 |
| 18 |
=17
| 13 |
| 18 |
(6)14×
| 7 |
| 13 |
=(13+1)×
| 7 |
| 13 |
=13×
| 7 |
| 13 |
| 7 |
| 13 |
=7+
| 7 |
| 13 |
=7
| 7 |
| 13 |
点评:考查了运算定律与简便运算,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律简便计算.
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