题目内容
用自己喜欢的方法计算下列各题.
(1)14.7×98+14.7×3-14.7
(2)
÷
+
×
(3)(
+
)×56
(4)
÷[(
+
)×
].
(1)14.7×98+14.7×3-14.7
(2)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
(3)(
| 7 |
| 8 |
| 3 |
| 7 |
(4)
| 17 |
| 9 |
| 4 |
| 9 |
| 1 |
| 2 |
| 9 |
| 17 |
考点:小数四则混合运算,运算定律与简便运算,分数的四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:(1)根据乘法分配律,提取14.7,即可;
(2)
÷
=
×
,然后根据乘法分配律,提取
即可;
(3)根据乘法分配律,展开,首先计算乘,然后求和;
(4)根据中括号内的部分根据乘法分配律展开,首先计算乘,然后求和,最后计算中括号外面的除法;即可.
(2)
| 7 |
| 9 |
| 11 |
| 5 |
| 7 |
| 9 |
| 5 |
| 11 |
| 5 |
| 11 |
(3)根据乘法分配律,展开,首先计算乘,然后求和;
(4)根据中括号内的部分根据乘法分配律展开,首先计算乘,然后求和,最后计算中括号外面的除法;即可.
解答:
解:(1)14.7×98+14.7×3-14.7
=14.7×(98+3-1)
=14.7×100
=1470
(2)
÷
+
×
=
×
+
×
=(
+
)×
=1×
=
(3)(
+
)×56
=
×56+
×56
=49+24
=73
(4)
÷[(
+
)×
]
=
÷(
×
+
×
)
=
÷(
+
)
=
÷
=
.
=14.7×(98+3-1)
=14.7×100
=1470
(2)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
(3)(
| 7 |
| 8 |
| 3 |
| 7 |
=
| 7 |
| 8 |
| 3 |
| 7 |
=49+24
=73
(4)
| 17 |
| 9 |
| 4 |
| 9 |
| 1 |
| 2 |
| 9 |
| 17 |
=
| 17 |
| 9 |
| 4 |
| 9 |
| 9 |
| 17 |
| 1 |
| 2 |
| 9 |
| 17 |
=
| 17 |
| 9 |
| 4 |
| 17 |
| 9 |
| 34 |
=
| 17 |
| 9 |
| 17 |
| 34 |
=
| 34 |
| 9 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算律简便计算.
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