题目内容
怎样简便怎样算.
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分析:(1)直接约分进行计算即可,
(2)把除法化成乘法,约分进行计算即可,
(3)先运用乘法的分配律进行简算,再算括号外的除法,
(4)把除法化成乘法,再运用乘法的分配律进行简算,
(5)先算乘法,再运用加法的运算定律进行简算,
(6)先算小括号里的加法,再算括号外的除法.
(2)把除法化成乘法,约分进行计算即可,
(3)先运用乘法的分配律进行简算,再算括号外的除法,
(4)把除法化成乘法,再运用乘法的分配律进行简算,
(5)先算乘法,再运用加法的运算定律进行简算,
(6)先算小括号里的加法,再算括号外的除法.
解答:解:(1)
×16×
,
=20×
,
=
;
(2)
÷12÷
,
=
×
×
,
=
×
,
=
;
(3)
÷[(
-
)×24],
=
÷[
×24-
×24],
=
÷[20-9],
=
÷11,
=
;
(4)
×
+
÷
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(5)
+
+
×
,
=
+
+
,
=
+(
+
),
=
+2,
=3
;
(6)
÷(
+
),
=
÷
,
=
.
| 5 |
| 4 |
| 1 |
| 8 |
=20×
| 1 |
| 8 |
=
| 5 |
| 2 |
(2)
| 3 |
| 8 |
| 5 |
| 16 |
=
| 3 |
| 8 |
| 1 |
| 12 |
| 16 |
| 5 |
=
| 1 |
| 32 |
| 16 |
| 5 |
=
| 1 |
| 10 |
(3)
| 11 |
| 3 |
| 5 |
| 6 |
| 3 |
| 8 |
=
| 11 |
| 3 |
| 5 |
| 6 |
| 3 |
| 8 |
=
| 11 |
| 3 |
=
| 11 |
| 3 |
=
| 1 |
| 3 |
(4)
| 5 |
| 7 |
| 8 |
| 5 |
| 2 |
| 7 |
| 5 |
| 8 |
=
| 5 |
| 7 |
| 8 |
| 5 |
| 2 |
| 7 |
| 8 |
| 5 |
=(
| 5 |
| 7 |
| 2 |
| 7 |
| 8 |
| 5 |
=1×
| 8 |
| 5 |
=
| 8 |
| 5 |
(5)
| 5 |
| 4 |
| 4 |
| 9 |
| 2 |
| 3 |
| 7 |
| 3 |
=
| 5 |
| 4 |
| 4 |
| 9 |
| 14 |
| 9 |
=
| 5 |
| 4 |
| 4 |
| 9 |
| 14 |
| 9 |
=
| 5 |
| 4 |
=3
| 1 |
| 4 |
(6)
| 9 |
| 10 |
| 3 |
| 5 |
| 9 |
| 10 |
=
| 9 |
| 10 |
| 3 |
| 2 |
=
| 3 |
| 5 |
点评:此题考查了分数的四则混合运算的顺序,灵活运用运算定律进行简算.
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