题目内容
下面各题,怎样简便就怎样算.
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24×(
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分析:①运用加法的结合律、交换律进行计算.
②一个数除以一个分数用这个数乘以这个分数的倒数,然后运用分数的乘法的计算法则进行计算.
③④运用乘法的分配律进行计算即可.
⑤根据四则混合运算的运算顺序计算即可.
②一个数除以一个分数用这个数乘以这个分数的倒数,然后运用分数的乘法的计算法则进行计算.
③④运用乘法的分配律进行计算即可.
⑤根据四则混合运算的运算顺序计算即可.
解答:解:①
-
-
+
=(
+
)-(
+
)
=2-1
=1
②
×
÷
=
×
×
=
=1
③
×58+
×41+
=
×(58+41+1)
=
×100
=12.5
④24×(
+
+
)
=24×
+24×
+24×
=9+4+10
=23
⑤
÷[(
-
)÷
]
=
÷[(
÷
]
=
÷
=
×5
=4
| 11 |
| 10 |
| 1 |
| 4 |
| 3 |
| 4 |
| 9 |
| 10 |
=(
| 11 |
| 10 |
| 9 |
| 10 |
| 1 |
| 4 |
| 3 |
| 4 |
=2-1
=1
②
| 8 |
| 9 |
| 3 |
| 4 |
| 8 |
| 15 |
=
| 8 |
| 9 |
| 3 |
| 4 |
| 15 |
| 8 |
=
| 5 |
| 4 |
=1
| 1 |
| 4 |
③
| 1 |
| 8 |
| 1 |
| 8 |
| 1 |
| 8 |
=
| 1 |
| 8 |
=
| 1 |
| 8 |
=12.5
④24×(
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=24×
| 3 |
| 8 |
| 1 |
| 6 |
| 5 |
| 12 |
=9+4+10
=23
⑤
| 4 |
| 5 |
| 5 |
| 8 |
| 1 |
| 2 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 1 |
| 8 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 1 |
| 5 |
=
| 4 |
| 5 |
=4
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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