题目内容
计算(能简算的要简算)
(1)
÷[(
+0.2)×
]
(2)
+
×
+0.375
(3)
÷3+
×
(4)
÷(1+
)+(5+
)+
.
(1)
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 13 |
(2)
| 1 |
| 7 |
| 7 |
| 8 |
| 5 |
| 7 |
(3)
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 3 |
(4)
| 7 |
| 6 |
| 5 |
| 9 |
| 2 |
| 3 |
| 5 |
| 4 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则,运算定律及简算
分析:(1)首先计算小括号里面的,然后计算中括号里面的,最后计算中括号外面的即可;
(2)根据加法结合律简算即可;
(3)根据乘法分配律简算即可;
(4)首先计算小括号里面的,然后根据加法交换律和结合律计算即可.
(2)根据加法结合律简算即可;
(3)根据乘法分配律简算即可;
(4)首先计算小括号里面的,然后根据加法交换律和结合律计算即可.
解答:
解:(1)
÷[(
+0.2)×
]
=
÷[
×
]
=
÷
=3
(2)
+
×
+0.375
=
+0.625+0.375
=
+(0.625+0.375)
=
+1
=1
(3)
÷3+
×
=
×
+
×
=(
+
)×
=1×
=
(4)
÷(1+
)+(5+
)+
=
×
+5
+
=
+5
+
=
+
+5
=2+5
=7
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 13 |
=
| 1 |
| 5 |
| 13 |
| 15 |
| 1 |
| 13 |
=
| 1 |
| 5 |
| 1 |
| 15 |
=3
(2)
| 1 |
| 7 |
| 7 |
| 8 |
| 5 |
| 7 |
=
| 1 |
| 7 |
=
| 1 |
| 7 |
=
| 1 |
| 7 |
=1
| 1 |
| 7 |
(3)
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 3 |
=
| 1 |
| 6 |
| 1 |
| 3 |
| 5 |
| 6 |
| 1 |
| 3 |
=(
| 1 |
| 6 |
| 5 |
| 6 |
| 1 |
| 3 |
=1×
| 1 |
| 3 |
=
| 1 |
| 3 |
(4)
| 7 |
| 6 |
| 5 |
| 9 |
| 2 |
| 3 |
| 5 |
| 4 |
=
| 7 |
| 6 |
| 9 |
| 14 |
| 2 |
| 3 |
| 5 |
| 4 |
=
| 3 |
| 4 |
| 2 |
| 3 |
| 5 |
| 4 |
=
| 3 |
| 4 |
| 5 |
| 4 |
| 2 |
| 3 |
=2+5
| 2 |
| 3 |
=7
| 2 |
| 3 |
点评:此题主要考查了整数、分数、小数、百分数四则混合运算,注意运算顺序,注意乘法运算定律的应用.
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