题目内容
脱式计算,能简算的要简算.
×
+
÷10
3-
×
-
9.9×17.6
8.6-(5.6+4.8)÷1.3
÷[1-(
+
)×
].
| 11 |
| 18 |
| 9 |
| 10 |
| 11 |
| 18 |
3-
| 5 |
| 9 |
| 7 |
| 20 |
| 11 |
| 36 |
9.9×17.6
8.6-(5.6+4.8)÷1.3
| 4 |
| 9 |
| 2 |
| 5 |
| 1 |
| 10 |
| 4 |
| 3 |
考点:分数的四则混合运算,运算定律与简便运算,小数四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法的分配律解答即可.
(2)先算乘法,然后根据减法的性质计算.
(3)根据乘法的分配律解答即可.
(4)先算加法,再算除法,最后算减法.
(5)先算加法,再算乘法,再算中括号里的减法,最后算除法.
(2)先算乘法,然后根据减法的性质计算.
(3)根据乘法的分配律解答即可.
(4)先算加法,再算除法,最后算减法.
(5)先算加法,再算乘法,再算中括号里的减法,最后算除法.
解答:
解:(1)
×
+
÷10
=
×(
+
)
=
×1
=
(2)3-
×
-
=3-
-
=3-(
+
)
=3-
=2
(3)9.9×17.6
=(10-0.1)×17.6
=10×17.6-1.76
=174.24
(4)8.6-(5.6+4.8)÷1.3
=8.6-10.4÷1.3
=8.6-8
=0.6
(5)
÷[1-(
+
)×
]
=
÷[1-
×
]
=
÷
=
| 11 |
| 18 |
| 9 |
| 10 |
| 11 |
| 18 |
=
| 11 |
| 18 |
| 9 |
| 10 |
| 1 |
| 10 |
=
| 11 |
| 18 |
=
| 11 |
| 18 |
(2)3-
| 5 |
| 9 |
| 7 |
| 20 |
| 11 |
| 36 |
=3-
| 7 |
| 36 |
| 11 |
| 36 |
=3-(
| 7 |
| 36 |
| 11 |
| 36 |
=3-
| 1 |
| 2 |
=2
| 1 |
| 2 |
(3)9.9×17.6
=(10-0.1)×17.6
=10×17.6-1.76
=174.24
(4)8.6-(5.6+4.8)÷1.3
=8.6-10.4÷1.3
=8.6-8
=0.6
(5)
| 4 |
| 9 |
| 2 |
| 5 |
| 1 |
| 10 |
| 4 |
| 3 |
=
| 4 |
| 9 |
| 1 |
| 2 |
| 4 |
| 3 |
=
| 4 |
| 9 |
| 1 |
| 3 |
=
| 4 |
| 3 |
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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