题目内容
计算下列各题.(注意使用简便算法)
×
+
×
-
×
(35+
)÷
1÷(
+
)×
.
| 5 |
| 6 |
| 3 |
| 7 |
| 5 |
| 6 |
| 4 |
| 7 |
| 5 |
| 8 |
| 5 |
| 8 |
| 4 |
| 15 |
(35+
| 7 |
| 25 |
| 7 |
| 5 |
1÷(
| 3 |
| 4 |
| 1 |
| 2 |
| 5 |
| 8 |
分析:(1)运用乘法的分配律进行简算,
(2)运用乘法的分配律进行简算,
(3)把除以
化成乘以
,再运用乘法的分配律进行简算,
(4)先算小括号里的加法,再算乘法,最后算乘法.
(2)运用乘法的分配律进行简算,
(3)把除以
| 7 |
| 5 |
| 5 |
| 7 |
(4)先算小括号里的加法,再算乘法,最后算乘法.
解答:解:(1)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(2)
-
×
,
=
×(1-
),
=
×
,
=
;
(3)(35+
)÷
,
=(35+
)×
,
=35×
+
×
,
=25+
,
=25
;
(4)1÷(
+
)×
,
=1÷
×
,
=
×
,
=
.
| 5 |
| 6 |
| 3 |
| 7 |
| 5 |
| 6 |
| 4 |
| 7 |
=
| 5 |
| 6 |
| 3 |
| 7 |
| 4 |
| 7 |
=
| 5 |
| 6 |
=
| 5 |
| 6 |
(2)
| 5 |
| 8 |
| 5 |
| 8 |
| 4 |
| 15 |
=
| 5 |
| 8 |
| 4 |
| 15 |
=
| 5 |
| 8 |
| 1 |
| 15 |
=
| 1 |
| 24 |
(3)(35+
| 7 |
| 25 |
| 7 |
| 5 |
=(35+
| 7 |
| 25 |
| 5 |
| 7 |
=35×
| 5 |
| 7 |
| 7 |
| 25 |
| 5 |
| 7 |
=25+
| 1 |
| 5 |
=25
| 1 |
| 5 |
(4)1÷(
| 3 |
| 4 |
| 1 |
| 2 |
| 5 |
| 8 |
=1÷
| 5 |
| 4 |
| 5 |
| 8 |
=
| 4 |
| 5 |
| 5 |
| 8 |
=
| 1 |
| 2 |
点评:此题考查了分数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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