题目内容
计算下面各题,能简算的要写出简算过程.
6÷
|
|
| ||||||||||||||||||||||
|
|
(0.5-
|
分析:(1)同时运算除法,再算减法;
(2)先把小括号里面的计算运用加法结合律简算,再算括号外的除法;
(3)先算除法,再算加法;
(4)先算小括号里面的乘法,再运用加法结合律简算;
(5)先把除法变成乘法,再运用乘法分配律简算;
(6)先同时运算两个小括号里面的减法,再算小括号里面的加法.
(2)先把小括号里面的计算运用加法结合律简算,再算括号外的除法;
(3)先算除法,再算加法;
(4)先算小括号里面的乘法,再运用加法结合律简算;
(5)先把除法变成乘法,再运用乘法分配律简算;
(6)先同时运算两个小括号里面的减法,再算小括号里面的加法.
解答:解:(1)6÷
-
÷6,
=14-
,
=13
;
(2)
÷(2+
+
),
=
÷[2+(
+
)],
=
÷(2+1),
=
÷3,
=
;
(3)
+
×5,
=
+
,
=4;
(4)
+(
-
×
),
=
+(
-
),
=
+
-
,
=1-
,
=
;
(5)
÷
+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(6)(0.5-
)÷(
+
),
=
÷
,
=
.
3 |
7 |
3 |
7 |
=14-
1 |
14 |
=13
13 |
14 |
(2)
3 |
4 |
3 |
11 |
8 |
11 |
=
3 |
4 |
3 |
11 |
8 |
11 |
=
3 |
4 |
=
3 |
4 |
=
1 |
4 |
(3)
1 |
4 |
3 |
4 |
=
1 |
4 |
15 |
4 |
=4;
(4)
4 |
5 |
1 |
5 |
3 |
4 |
4 |
7 |
=
4 |
5 |
1 |
5 |
3 |
7 |
=
4 |
5 |
1 |
5 |
3 |
7 |
=1-
3 |
7 |
=
4 |
7 |
(5)
1 |
4 |
9 |
8 |
8 |
9 |
3 |
4 |
=
1 |
4 |
8 |
9 |
8 |
9 |
3 |
4 |
=
8 |
9 |
1 |
4 |
3 |
4 |
=
8 |
9 |
=
8 |
9 |
(6)(0.5-
1 |
3 |
1 |
3 |
1 |
4 |
=
1 |
6 |
7 |
12 |
=
2 |
7 |
点评:此题主要考查分数、整数、小数的四则混合运算的运算顺序和应用运算定律进行简便计算.
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