题目内容
计算下面各题,能简算的要简算.
(
-
)×48
3200÷(1280-72×15)
5.89+8.17+2.83+4.11
÷[(
+
)×
].
(
| 5 |
| 6 |
| 3 |
| 8 |
3200÷(1280-72×15)
5.89+8.17+2.83+4.11
| 7 |
| 8 |
| 1 |
| 2 |
| 3 |
| 5 |
| 5 |
| 11 |
分析:①利用乘法分配律进行简算;
②利用整数的四则混合运算的计算方法解答;
③利用加法结合律进行简算;
④利用分数的四则混合运算的计算方法解答.
②利用整数的四则混合运算的计算方法解答;
③利用加法结合律进行简算;
④利用分数的四则混合运算的计算方法解答.
解答:解:①(
-
)×48,
=
×48-
×48,
=40-18,
=22;
②3200÷(1280-72×15),
=3200÷(1280-1080),
=3200÷200,
=16;
③5.89+8.17+2.83+4.11,
=(5.89+4.11)+(8.17+2.83),
=10+11,
=21;
④
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
.
| 5 |
| 6 |
| 3 |
| 8 |
=
| 5 |
| 6 |
| 3 |
| 8 |
=40-18,
=22;
②3200÷(1280-72×15),
=3200÷(1280-1080),
=3200÷200,
=16;
③5.89+8.17+2.83+4.11,
=(5.89+4.11)+(8.17+2.83),
=10+11,
=21;
④
| 7 |
| 8 |
| 1 |
| 2 |
| 3 |
| 5 |
| 5 |
| 11 |
=
| 7 |
| 8 |
| 11 |
| 10 |
| 5 |
| 11 |
=
| 7 |
| 8 |
| 1 |
| 2 |
=
| 7 |
| 4 |
点评:本题主要考查整数分数的四则混合运算,注意灵活运用运算定律进行简算.
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