题目内容
(2012?田东县模拟)计算(能简算的要简算).
| ①250×16-4848÷24 | ②(3+
| ||||||||||||||
③
|
④
| ||||||||||||||
⑤
|
⑥3.6-2.8+7.4-7.2. |
分析:①③⑤根据运算顺序解答即可;
②④利用乘法分配律进行简算即可;
⑥利用加法交换律与结合律可以进行简算.
②④利用乘法分配律进行简算即可;
⑥利用加法交换律与结合律可以进行简算.
解答:解:①250×16-4848÷24,
=4000-202,
=3798;
②(3+
)×5,
=3×5+
×5,
=15+
,
=15
;
③
×
-
×
,
=
-
,
=
;
④
÷23+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
⑤
×[1-(
-
)],
=
×[1-
+
],
=
×
,
=
;
⑥3.6-2.8+7.4-7.2,
=(3.6+7.4)-(2.8+7.2),
=11-10,
=1.
=4000-202,
=3798;
②(3+
| 3 |
| 20 |
=3×5+
| 3 |
| 20 |
=15+
| 3 |
| 4 |
=15
| 3 |
| 4 |
③
| 8 |
| 9 |
| 3 |
| 4 |
| 7 |
| 15 |
| 5 |
| 6 |
=
| 2 |
| 3 |
| 7 |
| 18 |
=
| 5 |
| 18 |
④
| 8 |
| 17 |
| 1 |
| 23 |
| 9 |
| 17 |
=
| 8 |
| 17 |
| 1 |
| 23 |
| 1 |
| 23 |
| 9 |
| 17 |
=(
| 8 |
| 17 |
| 9 |
| 17 |
| 1 |
| 23 |
=1×
| 1 |
| 23 |
=
| 1 |
| 23 |
⑤
| 4 |
| 29 |
| 3 |
| 4 |
| 3 |
| 8 |
=
| 4 |
| 29 |
| 3 |
| 4 |
| 3 |
| 8 |
=
| 4 |
| 29 |
| 5 |
| 8 |
=
| 5 |
| 58 |
⑥3.6-2.8+7.4-7.2,
=(3.6+7.4)-(2.8+7.2),
=11-10,
=1.
点评:四则混合运算的题目注意运算顺序,并抓住数字的特点合理运用运算定律进行简算.
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