题目内容
怎样算简便就怎样算
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|
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5÷
|
|
5-(
|
分析:(1)去括号进行计算即可;
(2)把除数转化为乘它的倒数,再运用乘法分配律进行简便计算;
(3)先算括号里的减法,再算括号外的除法;
(4)把除数转化为乘它的倒数,再运用分数四则混合运算的运算顺序进行计算;
(5)根据分数四则混合运算的运算顺序进行计算,先算括号里的除法,然后去括号计算;
(6)根据分数四则混合运算的运算顺序进行计算,先算括号里的除法,再算加法,最后算括号外的减法.
(2)把除数转化为乘它的倒数,再运用乘法分配律进行简便计算;
(3)先算括号里的减法,再算括号外的除法;
(4)把除数转化为乘它的倒数,再运用分数四则混合运算的运算顺序进行计算;
(5)根据分数四则混合运算的运算顺序进行计算,先算括号里的除法,然后去括号计算;
(6)根据分数四则混合运算的运算顺序进行计算,先算括号里的除法,再算加法,最后算括号外的减法.
解答:解:(1)
×(26×
),
=
×26×
,
=6;
(2)
÷
-
×
,
=
×
-
×
,
=(
-
)×
,
=
×
,
=
;
(3)
÷(
-
),
=
÷
,
=
×
,
=6;
(4)5÷
-
×
,
=5×
-
×
,
=7-
,
=6
;
(5)
-(
÷
+
),
=
-(
×
+
),
=
-(
+
),
=
-
-
,
=1-
,
=
;
(6)5-(
÷
+
),
=5-(
×
+
),
=5-(4+
),
=5-4
,
=
.
| 40 |
| 13 |
| 3 |
| 40 |
=
| 40 |
| 13 |
| 3 |
| 40 |
=6;
(2)
| 7 |
| 8 |
| 8 |
| 9 |
| 3 |
| 8 |
| 9 |
| 8 |
=
| 7 |
| 8 |
| 9 |
| 8 |
| 3 |
| 8 |
| 9 |
| 8 |
=(
| 7 |
| 8 |
| 3 |
| 8 |
| 9 |
| 8 |
=
| 4 |
| 8 |
| 9 |
| 8 |
=
| 9 |
| 16 |
(3)
| 8 |
| 5 |
| 3 |
| 5 |
| 1 |
| 3 |
=
| 8 |
| 5 |
| 4 |
| 15 |
=
| 8 |
| 5 |
| 15 |
| 4 |
=6;
(4)5÷
| 5 |
| 7 |
| 5 |
| 7 |
| 1 |
| 5 |
=5×
| 7 |
| 5 |
| 5 |
| 7 |
| 1 |
| 5 |
=7-
| 1 |
| 7 |
=6
| 6 |
| 7 |
(5)
| 12 |
| 7 |
| 1 |
| 3 |
| 7 |
| 15 |
| 4 |
| 5 |
=
| 12 |
| 7 |
| 1 |
| 3 |
| 15 |
| 7 |
| 4 |
| 5 |
=
| 12 |
| 7 |
| 5 |
| 7 |
| 4 |
| 5 |
=
| 12 |
| 7 |
| 5 |
| 7 |
| 4 |
| 5 |
=1-
| 4 |
| 5 |
=
| 1 |
| 5 |
(6)5-(
| 6 |
| 7 |
| 3 |
| 14 |
| 3 |
| 16 |
=5-(
| 6 |
| 7 |
| 14 |
| 3 |
| 3 |
| 16 |
=5-(4+
| 3 |
| 16 |
=5-4
| 3 |
| 16 |
=
| 13 |
| 16 |
点评:此题主要考查分数四则混合运算的顺序,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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