题目内容
| 直接写得数 16×(1000+
|
2-
|
分析:(1)运用乘法的分配律进行计算.
(2)运用加法的结合律,交换律进行计算,使计算更加简便.
(2)运用加法的结合律,交换律进行计算,使计算更加简便.
解答:解:(1)16×(1000+
),
=16000+16×
,
=16000+1,
=16001;
(2)2-
+
-
+
-
,
=2-(
+
+
)+(
+
),
=2-1
+
,
=
-
,
=
-
,
=
;
| 1 |
| 16 |
=16000+16×
| 1 |
| 16 |
=16000+1,
=16001;
(2)2-
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 4 |
=2-(
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 3 |
| 1 |
| 3 |
=2-1
| 1 |
| 4 |
| 2 |
| 3 |
=
| 3 |
| 4 |
| 2 |
| 3 |
=
| 9 |
| 12 |
| 8 |
| 12 |
=
| 1 |
| 12 |
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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