题目内容
(1)
|
(2)
| ||||||||||||||||
(3)
|
(4)45×
|
分析:(1)先算除法和乘法,再算加法;
(2)根据乘法分配律进行简算;
(3)先算乘法,再算除法,最后算减法;
(4)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)先算乘法,再算除法,最后算减法;
(4)根据乘法分配律进行简算.
解答:解:
(1)
÷
+
×
,
=
+
,
=
;
(2)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=
;
(3)
×
÷
-
,
=
÷
-
,
=
-
,
=
;
(4)45×
,
=(44+1)×
,
=44×
+1×
,
=43+
,
=43
.
(1)
| 1 |
| 2 |
| 5 |
| 8 |
| 1 |
| 4 |
| 3 |
| 5 |
=
| 4 |
| 5 |
| 3 |
| 20 |
=
| 19 |
| 20 |
(2)
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
| 5 |
| 2 |
=
| 3 |
| 4 |
| 2 |
| 5 |
| 1 |
| 4 |
| 2 |
| 5 |
=(
| 3 |
| 4 |
| 1 |
| 4 |
| 2 |
| 5 |
=
| 2 |
| 5 |
(3)
| 10 |
| 21 |
| 7 |
| 20 |
| 5 |
| 6 |
| 1 |
| 4 |
=
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 4 |
=
| 1 |
| 5 |
| 1 |
| 4 |
=
| 1 |
| 20 |
(4)45×
| 43 |
| 44 |
=(44+1)×
| 43 |
| 44 |
=44×
| 43 |
| 44 |
| 43 |
| 44 |
=43+
| 43 |
| 44 |
=43
| 43 |
| 44 |
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定律简便计算.
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